LIPEZ, Circuit Judge.
Morris Goldings, an inmate at the Federal Medical Center Devens, in Ayer, Massachusetts, brought this civil action against the Warden of FMC Devens, David Winn, and Attorney General John Ashcroft, challenging a change in policy by the Bureau of Prisons (“BOP”) that limited his eligibility for placement in a community corrections center (“CCC”) to the last ten percent of his sentence. He sought declaratory and injunctive relief enjoining the defendants from applying the new policy to him. The defendants moved to dismiss the complaint for failure to state a claim pursuant to Federal Rule of Civil Procedure 12(b)(6). The district court granted the motion, and Goldings appealed.
[19]*19The policy change that is the subject of this lawsuit was required by a December 13, 2002 Memorandum Opinion from the Department of Justice Office of Legal Counsel, which declared unlawful the BOP’s prior practice of placing federal prisoners in community confinement to serve all or part of their sentences. Gold-ings argues that the BOP’s policy is based on an erroneous interpretation of two statutory provisions of the Sentencing Reform Act of 1984, 18 U.S.C. § § 3621(b) and 3624(c). According to this interpretation, these two provisions limit the BOP’s discretion to place prisoners in CCCs to the lesser of the last six months or ten percent of their terms of imprisonment. Although the change in policy has generated a flood of lawsuits in the federal district courts, no court of appeals has yet spoken on the validity of the BOP’s new policy. We do so here and conclude that the new policy is contrary to the plain meaning of 18 U.S.C. § 3621(b).
I.
On July 17, 2002, Goldings pled guilty in the United States District Court for the District of Massachusetts to three counts of tax fraud, in violation of 18 U.S.C. §§ 1341, 1343, and 1956. He was sentenced to a thirty-six month term of imprisonment. On August 28, 2002, Goldings reported to Federal Medical Center De-vens, the correctional facility designated by the Bureau of Prisons, to commence his sentence.
When Goldings entered federal custody, the BOP considered prisoners for placement in community correction centers near the end of their sentences, for up to six months, pursuant to a longstanding practice.1 In addition, the BOP had a policy of placing in CCCs some low-risk, non-violent federal offenders who had been sentenced to short periods of imprisonment, including for periods of more than six months, particularly if the sentencing court so recommended.
On December 13, 2002, about three-and-a-half months after Goldings began serving his sentence, the Office of Legal Counsel of the United States Department of Justice (OLC) forwarded to Deputy Attorney General Larry D. Thompson an eight-page memorandum that characterized as “unlawful” the BOP’s decades-long practice of placing certain offenders in CCCs to serve all or part of their sentences. It stated, in part:
Your office has informed us that when a federal offender whom the [BOP] deems to be low-risk and nonviolent receives a short sentence of imprisonment, BOP often places that offender in a community corrections center, halfway house, or other form of “community confinement,” rather than in prison. Your office has asked us to advise you whether BOP has general authority, either upon the recommendation of the sentencing judge or otherwise, to place such an offender directly in community confinement at the outset of his sentence or to transfer him from prison to community confinement during the course of his sentence.
[20]*20We conclude below that the BOP has no such general authority. As we explain, BOP’s statutory authority to implement sentences of imprisonment must be construed, wherever possible, to comport with the legal requirements that govern the federal courts’ sentencing order. Community confinement does not constitute imprisonment for purposes of a sentencing order, and BOP lacks clear general statutory authority to place in community confinement an offender who has been sentenced to a term of imprisonment. BOP’s practice is therefore unlawful.
The OLC Memorandum also specifically concluded that the BOP lacked statutory authority to transfer inmates to CCCs for more than ten percent of their sentences, explaining that “[t]he authority conferred under section 3624(c) to transfer a prisoner to a non-prison site is clearly limited to a period ‘not to exceed six months, of the last 10 per centum of the time to be served,’ and we see no basis for disregarding this time limitation.” (internal citation omitted).
On December 16, 2002, the Deputy Attorney General adopted the OLC Memorandum and forwarded it to the Director of the BOP, with a memorandum that directed the BOP to “take all steps necessary to ensure that its sentencing decisions are in full compliance with the governing law” and to transfer to prison facilities all offenders residing in CCCs who had more than 150 days remaining of their terms of imprisonment. The memorandum reiterated that
while BOP does have limited statutory authority in 18 U.S.C. § 3624(c) to transfer an offender to a CCC prior to his release so as to “afford the prisoner a reasonable opportunity to adjust to and prepare for the prisoner’s re-entry into the community,” there are firm restrictions on such transfers. Specifically, the transfer may not exceed the lesser of (i) the last ten percent of the sentence imposed on the offender, ie., the period of time in which the offender was committed to the custody of the BOP, or (ii) six months. The OLC opinion concludes that there are no bases for disregarding the time limitations.
Id. at 2 (emphasis in the original).
On December 20, 2002, the Assistant Directors for the General Counsel and Chief Programs Division of the BOP issued a memorandum that directed all BOP officers to implement immediately a “revised procedure” based on the OLC Memorandum. In accordance with that directive, Warden Winn informed the inmates of the FMC Devens Camp that because of the OLC Memorandum, the BOP had changed its procedures for designating inmates to CCCs. He explained that all future pre-release CCC designations would be limited to the last ten percent of an inmate’s prison term.
After exhausting his administrative remedies, Goldings, who was an attorney prior to his conviction, filed this action pro se in the United States District Court for the District of Massachusetts. His complaint alleged that under the BOP policy in effect at the time of his sentencing, he would have been eligible for transfer to a CCC as early as October 7, 2004, six months before his statutory release date. In contrast, under the new policy, his transfer is not possible until January 7, 2005, when he will have only ten percent of his sentence left to serve. The complaint alleged that the new BOP procedure was incorrect as a matter of statutory interpretation, was established in violation of the notice and comment requirements of the Administrative Procedure Act (APA), and violated Goldings’ rights under the Ex Post Facto and Due Process Clauses of the United States Constitution. Goldings sought a declaration that § 3621(b) authorizes the [21]*21BOP to transfer him to a CCC or halfway house for more than the last ten percent of his sentence, if appropriate, under the BOP’s pre-December 2002 policy, and an injunction enjoining the defendants from limiting his eligibility for placement in a CCC to the last ten percent of his sentence based on the OLC Memorandum.
The defendants moved to dismiss Gold-ings’ complaint pursuant to Fed.R.Civ.P. 12(b)(6); on October 23, 2003, the district court granted the motion. In a brief re-script, the court stated that it agreed with the reasons expressed by two other district courts in the District of Massachusetts in similar cases; in particular, the court cited the conclusion that “the BOP’s revised policy merely corrected an erroneous interpretation of 18 U.S.C. § 3624(c).” The district court distinguished two other cases decided in the district which “criticized application of the BOP policy” on the ground that those cases “involved assignments to a CCC at the beginning of a defendant’s sentence ... [and] were governed by 18 U.S.C. § § 3621(b) and 3625.” By contrast, “Goldings’ case ... involves transfer to a CCC at the end of his sentence, and is accordingly governed by 18 U.S.C. § 3624(c).” Hence, the court found no constitutional or statutory violation and rejected Goldings’ alternative arguments concerning equitable estoppel and reasonable expectations. This appeal followed.2
II.
Our review of the district court’s decision granting the defendants’ Rule 12(b)(6) motion to dismiss is de novo. La-Chapelle v. Berkshire Life Ins. Co., 142 F.3d 507, 509 (1st Cir.1998). At issue in this case is the validity of the defendants’ interpretation of 18 U.S.C. § 3621(b) and § 3624(c), the statutory provisions that govern the BOP’s authority to decide where a federal offender must serve all or part of his or her sentence.3 In particular, we must consider whether the BOP has authority under the statute to transfer a federal prisoner to a CCC prior to the lesser of the last six months or ten percent of his or her sentence.4
“We review de novo an agency’s construction of a statute that it administers, although subject to established principles of deference.” Griffiths v. INS, 243 F.3d 45, 49 (1st Cir.2001). If “the language of the statute is plain and admits of no more than one meaning” or if the statute’s legislative history “reveals an unequivocal answer” as to the statute’s meaning, “we do not look to the interpretation that may be given to the statute by the agency charged with its enforcement.” Arnold v. United Parcel Serv., Inc., 136 F.3d 854, 858 (1st Cir.1998) (internal quotation marks omitted); see Chevron, U.S.A., Inc. v. Natural Res. Def. Council, Inc., 467 U.S. 837, 842-43, 104 S.Ct. 2778, 81 L.Ed.2d 694 (1984) (“If the intent of Congress is clear, that is the end of the matter; for the court as well as the agency, must give effect to the unambiguously expressed intent of Congress.”).
A. 18 U.S.C. § 3624(c)
“As in any case of statutory construction, our analysis begins with the ‘language [22]*22of the statute.’ ” Hughes Aircraft Co. v. Jacobson, 525 U.S. 432, 438, 119 S.Ct. 755, 142 L.Ed.2d 881 (1999). Section 3624(c) sets forth the steps the BOP is required to take at the end of a term of imprisonment to ease a prisoner back into society. It provides:
c) Pre-release custody.—The Bureau of Prisons shall, to the extent practicable, assure that a prisoner serving a term of imprisonment spends a reasonable part, not to exceed six months, of the last 10 per centum of the term to be served under conditions that will afford the prisoner a reasonable opportunity to adjust to and prepare for the prisoner’s re-entry into the community. The authority provided by this subsection may be used to place a prisoner in home confinement.
18 U.S.C. § 3624(c). According to the defendants, § 3624(c) authorizes the BOP to transfer inmates to CCCs for up to ten percent of their terms of imprisonment but limits that authority to a “reasonable part, not to exceed six months, of the last 10 per centum of the term to be served.”
Goldings agrees that § 3624(c) contains limiting language. However, he argues that the statute limits only the BOP’s statutory obligation to “assure” that a prisoner spends a reasonable part of the last ten percent of his term of imprisonment under pre-release conditions. He contends that the mandatory directive of § 3624(c) does not limit the discretionary authority committed to the BOP under § 3621(b), pursuant to which the BOP “may designate any available penal or correctional facility” as a place of imprisonment and “may at any time ... direct the transfer of a prisoner from one penal or correctional facility to another.” The latter statute provides, in relevant part:
The Bureau of Prisons shall designate the place of the prisoner’s imprisonment. The Bureau may designate any available penal or correctional facility that meets minimum standards of health and habitability .... The Bureau may at any time ... direct the transfer of a prisoner from one penal or correctional facility to another.
18 U.S.C. § 3621(b). Under the new policy, the defendants take the view that a CCC is not a “place of imprisonment” for purposes of § 3621(b). According to the defendants, the discretion that § 3621(b) affords the BOP in determining a prisoner’s “place of imprisonment” does not include discretion to place the prisoner in a CCC, either at the outset or at the end of a prisoner’s term. Therefore, the defendants claim that § 3624(c) alone authorizes placement in a CCC, limiting that placement to the lesser of the last ten percent or six months of the prisoner’s term of imprisonment.
The district court did not address the validity of the defendants’ interpretation of § 3621(b) because it concluded that this provision was implicated only by assignments to a CCC at the beginning of a prisoner’s sentence. In the court’s view, “Goldings’ case ... involves transfer to a CCC at the end of his sentence, and is accordingly governed by 18 U.S.C. § 3624(c).” We disagree with the district court that Goldings’ claim may be resolved on the basis of § 3624(c) alone, without also considering the applicability of § 3621(b) to CCC placements. There is no language in § 3621(b) that limits the BOP’s designation authority to the prisoner’s initial place of imprisonment. It expressly provides that “[t]he [BOP] may at any time ... direct the transfer of a prisoner from one penal or correctional facility to another.” (emphasis added). Thus, on its face, § 3621(b) permits the BOP to direct Goldings’ transfer to a CCC prior to the last ten percent of his prison term, [23]*23unless, as the defendants argue, § 3621(b) does not apply to CCC placements at all because a CCC is not a “place of imprisonment.” In avoiding this argument of the defendants, the district court essentially used the limiting language of § 3624(c) to rewrite the unambiguous language of § 3621(b) so that “at any time” no longer means “at any time,” but rather “only for the lesser of the last six months or ten percent of a prisoner’s term of imprisonment.” The significance of this rewriting cannot be ignored. Indeed, the defendants do not argue on appeal the district court’s position that Goldings’ case only requires consideration of § 3624(c). Thus, we cannot avoid addressing the relationship between § 3621(b) and § 3624(c).5
By its plain language, § 3624(c) provides that the BOP “shall take steps” to “assure” that prisoners serve a reasonable part of the last ten percent of their prison terms “under conditions that afford the prisoner a reasonable opportunity to adjust to and prepare for the prisoner’s reentry into the community.” This language imposes an affirmative obligation on the BOP to take steps to facilitate a smooth re-entry for prisoners into the outside world. It is true that this obligation is qualified. Section 3624(c) does not mandate placement in a CCC prior to release, and it requires the BOP to assure that a prisoner spends the last part of his sentence under pre-release conditions only if practicable. However, a qualified obligation differs from a grant of discretion. Under § 3624(c), the BOP must ensure placement under pre-release conditions except where no such placement is practicable. As the Tenth Circuit has explained, § 3624(c) operates as “a legislative directive focusing on the development of conditions to facilitate an inmate’s adjustment to free society, whatever the institution of pre-release confinement.” Prows v. Fed. Bureau of Prisons, 981 F.2d 466, 470 (10th Cir.1992).6 The provision thus reflects Congress’s intent to impose upon the agency a duty to prepare prisoners for reentry into the community, without tying the hands of administrators in deciding where prisoners are to be placed. The BOP is not free to disregard that duty. If it did so, judicial relief might be available. See id. at 649 (suggesting that although prisoner did not have an enforceable right under § 3624(c) to placement in a CCC, he might have had a valid cause of action based on the claim that his placement [24]*24“constitute[d] a violation of a broader obligation to provide at least some pre-release treatment conducive to successful re-entry into the community, whatever the facility of incarceration”).
At the same time, we agree with the Tenth Circuit that § 3624(c)’s mandate “to facilitate the prisoner’s post-release adjustment through the establishment of some unspecified pre-release conditions ... accepts as a premise that the broader statutory scheme concerning the Bureau’s general placement authority remains intact and effective.” Id. at 469-70. Thus, while § 3624(c) clearly limits the BOP’s discretion not to consider community confinement or other pre-release alternatives at the end of a prisoner’s prison term, it does not prohibit the BOP from doing so earlier pursuant to a different grant of discretionary authority.7
B. 18 U.S.C. § 3621(b)
Having determined that § 3624(c) does not prohibit the BOP from transferring prisoners to a CCC prior to the lesser of six months or ten percent of the end of their prison terms, we must next consider whether § 3621(b) confers upon the BOP discretionary authority to execute such transfers. We begin by considering the language of the statute:
(a) Commitment to the custody of the Bureau of Prisons. — A person who has been sentenced to a term of imprisonment ... shall be committed to the custody of the Bureau of Prisons....
(b) Place of imprisonment. — The Bureau of Prisons shall designate the place of the prisoner’s imprisonment. The Bureau may designate any available penal or correctional facility that meets minimum standards of health and habitability established by the Bureau ... that the Bureau determines to be appropriate and suitable, considering -
(1) the resources of the facility contemplated;
(2) the nature and circumstances of the offense;
(3) the history and characteristics of the prisoner;
(4) any statement by the court that imposed the sentence-
(A) concerning the purposes for which the sentence to imprisonment was determined to be warranted; or
(B) recommending a type of penal or correctional facility as appropriate; and
(5) any pertinent policy statement issued by the Sentencing Commission pursuant to section 994(a)(2) of title 28....
The Bureau may at any time, having regard for the same matters, direct the transfer of a prisoner from one penal or correctional facility to another.
[25]*25Goldings argues that this section provides a broad grant of authority to the BOP initially to designate, and subsequently to transfer, a prisoner to “any available penal or correctional facility.” He further claims that a CCC is a “penal or correctional facility” and that, therefore, the BOP has statutory authority to transfer a petitioner to a CCC at any time during his or her term of imprisonment. The defendants do not contend that a community correction center is not a “correctional facility.”8 Instead, they argue that a CCC is not a “place ... of imprisonment” as required by the first sentence of § 3621(b), and that the second sentence of the provision is limited by the first. Thus, when designating the place where a prisoner will serve all or part of his or her term of imprisonment, the BOP may choose from among the subset of penal or correctional facilities that qualify as places of imprisonment. In other words, a “place of imprisonment” is a penal or correctional facility that is a place of imprisonment.
The defendants’ circular definition is unsupported by the plain language of § 3621. Subsection 3621(a) directs “persons” sentenced to serve a term of imprisonment “to the custody of the Bureau of Prisons,” thereby rendering them “prisoners” and hence “imprisoned” for the purposes of § 3621(b). Pursuant to § 3621(a), it is not the place of imprisonment that determines whether an offender is imprisoned but the fact and nature of the offender’s sentence- (“sentenced to a term of imprisonment”) and the identity of the custodian (the BOP). See United States v. Cintron-Fernandez, 356 F.3d 340, 346 (1st Cir.2004) (holding that offender sentenced to a term of imprisonment and subsequently detained in his home was not “imprisoned” because the BOP never assumed custody of the offender as required by 18 U.S.C. § 3621); cf. Koray, 515 U.S. at 63-65, 115 S.Ct. 2021 (recognizing that the relevant criteria for determining whether a court-imposed period of pre-trial detention in a CCC or other facility may be credited against a term of imprisonment is not the type or place of confinement but whether the defendant is in BOP custody).
The first sentence of § 3621(b) imposes a duty on the BOP to place those prisoners who haye been committed to the custody of the BOP. It does not further define “place of imprisonment” and certainly does not provide that the BOP may not place prisoners in a CCC. The second sentence of this subsection gives content to the first; it explains where prisoners may be placed and grants the BOP discretionary authority to choose that place of imprisonment from among “any” available penal or correctional institution. See, e.g., United States v. King, 338 F.3d 794, 798 (7th Cir.2003) (“Under 18 U.S.C. § 3621(b), the BOP is authorized to house a prisoner ... anywhere it deems appropriate.”) (emphasis added); Prows, 981 F.2d at 469 n. 3 (“Under 18 U.S.C. § 3621(b), the Bureau of Prisons ... may direct confinement in any available facility and may transfer a prisoner from one facility to another at any time.”). That broad discretion is limited only by the requirement that the place of imprisonment be a “penal or correctional facility” and that it .“meet minimum standards of health and habitability.” See Cintron-Fernandez, 356 [26]*26F.3d at 346 (“According to 18 U.S.C. § 3621(b), the Bureau is supposed to choose a ‘penal or correctional facility’ and determine that the facility meets enumerated minimum standards of health and habitability.”). Congress could have, but did not, exclude any particular type of penal or correctional facility from the BOP’s designation or transfer authority. Instead, it defined “place of imprisonment” broadly but unambiguously, as “any penal or correctional facility” that meets minimum standards of health and habitability. Hence, the relevant question in considering whether the BOP has discretion under § 3621(b) to transfer Goldings to a CCC is whether a CCC qualifies as a “penal or correctional facility.” Cfi id. at 346 n. 6 (noting without deciding “the issue of whether [the prisoner’s] home could ever qualify as a ‘penal or correctional facility’ under 18 U.S.C. § 3621(b)”). If it does, then the text of the statute dictates that it also qualifies as a “place of imprisonment.” Since a community corrections facility is clearly a corrections facility (and, as noted, the OLC Memorandum did not suggest otherwise), the BOP may place prisoners there prior to the lesser of the last six months or ten percent of their terms of imprisonment.9
The defendants insist, however, that this reading of § 3621(b) “cannot be squared with the plain meaning of § 3624(c) and elementary rules of statutory construction” because it would “effectively render § 3624(c) a nullity.” In other words, “[i]t simply cannot be true that § 3624(c) limits placement in a CCC to the shorter of six months or to the last 10 percent of the prisoner’s term, and also be true that § 3621(b) allows placement in a CCC at any time during the prisoner’s sentence.” Defendants’ incredulity apparently reflects a refusal to recognize the distinction between a qualified obligation imposed on the BOP and a grant of discretionary authority to it. As we have already noted, § 3624(c) limits the BOP’s obligation to assure that a prisoner spends the last part of his sentence under pre-release conditions, whether in a CCC or elsewhere. It does not limit the agency’s discretionary authority to place a prisoner in a CCC at any other time during the prisoner’s sentence. Therefore, § 3621(b) and § 3624(c) do not, as defendants suggest, “authorize two analytically separate but practically redundant systems for administering community confinement.” Moreover, § 3624(c) directs the BOP to assure that a “prisoner serving a term of imprisonment spend a reasonable part of that term [of imprisonment]” under pre-release conditions, including (expressly) home detention and (impliedly) community confinement. If, as both parties agree, a CCC may be a place of imprisonment during the last ten percent of a prisoner’s term of imprisonment, it would be incongruous to conclude that the same [27]*27CCC may not be a place of imprisonment during any portion of the first ninety percent of that term..
The defendants also find support for their interpretation of § 3621(b) in 18 U.S.C. § 1791(d)(4), which prohibits the provision or possession of contraband in prison and defines “prison,” for the purposes of that section, as “a Federal correctional, detention, or penal facility.” According to the defendants, “[t]his definition suggests that a ‘correctional facility’ and ‘penal facility’ are, first, synonymous, and, second, the equivalent of a ‘prison,’ where inmates generally live in cells behind bars and — unlike community confinement — are not free to leave for various purposes.” We do not understand the logic of this argument. Section 1791(d) explicitly adopts a . broad definition of “prison” for the specific purposes of that section, which includes all federal correctional, detention, and penal facilities — -just as § 3621(b) defines the different term, “place of imprisonment,” broadly to include those same correctional and penal facilities. Nowhere does § 1791(d) define a “penal or correctional facility” as a facility in which inmates are confined to cells behind bars without ever being allowed to leave.
Indeed, the defendants’ interpretation of § 3621 is inconsistent with the Sentencing Reform Act and the ordinary meaning of modern-day imprisonment. The BOP is expressly authorized to allow prisoners to leave their “place of imprisonment” for limited periods of time to work or pursue education in the community “while continuing in official detention at the penal or correctional facility.” 18 U.S.C. § 3622(c). This kind of controlled exposure to the community is entirely consistent with the meaning of imprisonment under the statute. See Byrd v. Moore, 252 F.Supp.2d 293, 301 (W.D.N.C.2003) (While inmates of CCCs “are able to leave under some limited circumstances as outlined by 18 U.S.C. § 3622, they are not free to come and go as they please. They are ‘imprisoned.’ ”); see also Iacaboni v. United States, 251 F.Supp.2d 1015, 1029 (D.Mass.2003) (“In a modern penal system, it is the ráre prisoner who is immured behind six-foot-thick walls 365 days a year like some character out of a Dumas romance.”).
The defendants further argue that § 3621(b) should be construed in light of 18 U.S.C. § 3563(b)(11) of the Sentencing Reform Act, which authorizes courts to sentence offenders to a term of probation, a fine, or a term of imprisonment. They argue that this section allows courts to require a defendant, as a condition of probation, to “reside at, or participate in the program of, a community corrections facility.” 18 U.S.C. § 3563(b)(11). They further note that placement in a CCC may be authorized as a condition of a term of supervised release. See 18 U.S.C. § 3583(a). Because a sentence of probation is an alternative to, and may not be imposed at the same time as, a sentence of imprisonment, 18 U.S.C. § 3561(a)(3), and because a term of supervised release occurs after a term of imprisonment, the defendants argue that a CCC cannot be a “place of imprisonment.”
Again, the defendants’ argument is unpersuasive. The Sentencing Reform Act addresses the three types of sentences that courts may impose; it does not limit the scope of the BOP’s authority to designate the place where an. offender sentenced to a term of imprisonment must serve that sentence. The fact that residence at or participation in a program of a CCC may serve as. a condition, of probation or supervised release for some offenders does not mean that a CCC cannot be a place of imprisonment for other offenders, based on the nature of their sentences and whether they are subject to the control of [28]*28the BOP. See Koray, 515 U.S. at 61, 63, 115 S.Ct. 2021 (detention in a CCC subject to the control of the BOP may be credited against a term of imprisonment under 18 U.S.C. § 3585, whereas confinement in the same facility as a condition of bail may not because “defendants who are ‘detained’ or ‘sentenced’ always remain subject to the control of the Bureau”).
Finally, we note that the OLC’s interpretation of “place of imprisonment” as exclusive of CCCs relied primarily on a line of cases in which courts have held that confinement in a CCC is not imprisonment as that term is used in 5C1.1 of the United States Sentencing Guidelines, which governs the kinds of sentences that may be imposed by courts for offenders within Zone C or D of the Guidelines. Although we recently joined this line of authority, we cautioned that “our interpretation of imprisonment does not necessarily apply to provisions [of the Sentencing Guidelines] other than § 5C1.1.” Cintron-Fernandez, 356 F.3d at 347 & n. 7 (explaining that definitions of terms in the Guidelines “are not designed for general applicability”). Moreover, as the defendants appear to recognize in their brief to this court, to the extent that § 3621(b) conflicts with a section of the Sentencing Guidelines, the Guidelines must yield. United States v. LaBonte, 520 U.S. 751, 757, 117 S.Ct. 1673, 137 L.Ed.2d 1001 (1997). Also, as we have recognized, the Guidelines are binding only on the courts. They do not address the BOP’s use of its discretion as the custodian of federal prisoners to designate the appropriate place of imprisonment. See Cintron-Fernandez, 356 F.3d at 347 n. 7 & 346 n. 6 (holding that “in the context of 5C1.1, the minimum half term of ‘imprisonment’ cannot be satisfied by home detention or by community confinement” while expressly reserving the question of whether the home can ever qualify as a “penal or correctional facility” which the BOP may designate as a “place of imprisonment” under 18 U.S.C. § 3621(b)).
We end our consideration of the defendants’ arguments here. Under § 3621(b), the BOP has discretionary authority to designate any available penal or correctional facility that meets minimum standards of health and habitability as the place of a prisoner’s imprisonment, and to transfer a prisoner at any time to such a facility. A community correction center is a correctional facility and therefore may serve as a prisoner’s place of imprisonment. “When as now, the plain language of a statute unambiguously reveals its meaning, and the revealed meaning is not eccentric, courts need not consult other aids to statutory construction.” United States v. Meade, 175 F.3d 215, 219 (1st Cir.1999). Because the intent of Congress is clear in its grant of discretionary authority to the BOP to transfer a prisoner to any available penal or correctional facility, we must give effect to that intent. Chevron, 467 U.S. at 843, 104 S.Ct. 2778. The defendants’ interpretation of § 3621(b) is contrary to the plain meaning of the statute; it is not entitled to judicial deference.10
III.
For the foregoing reasons, we hold that 18 U.S.C. § 3621(b) authorizes the BOP to transfer Goldings to a CCC at any time during his prison term. The BOP’s discre[29]*29tionary authority under § 3621(b) is not subject to the temporal limitations of 18 U.S.C. § 3624(c). We vacate the order of the district court granting the defendants’ motion to dismiss and remand for further proceedings consistent with this opinion.
So ordered.
APPENDIX
18 U.S.C. § 3621. Imprisonment of a convicted person
(a) Commitment to the custody of the Bureau of Prisons. — A person who has been sentenced to a term of imprisonment pursuant to the provisions of subchapter D of chapter 227 shall be committed to the custody of the Bureau of Prisons until the expiration of the term imposed, or until earlier released for satisfactory behavior pursuant to the provisions of section 3624.
(b) Place of imprisonment. — The Bureau of Prisons shall designate the place of the prisoner’s imprisonment. The Bureau may designate any available penal or correctional facility that meets minimum standards of health and habitability established by the Bureau, whether maintained by the Federal Government or otherwise and whether within or without the judicial district in which the person was convicted, that the Bureau determines to be appropriate and suitable, considering -
(1) the resources of the facility contemplated;
(2) the nature and circumstances of the offense;
(3) the history and characteristics of the prisoner;
(4) any statement by the court that imposed the sentence -
(A) concerning the purposes for which the sentence to imprisonment was determined to be warranted; or
(B) recommending a type of penal or correctional facility as appropriate; and
(5)any pertinent policy statement issued by the Sentencing Commission pursuant to section 994(a)(2) of title 28.
In designating the place of imprisonment or making transfers under this subsection, there shall be no favoritism given to prisoners of high social or economic status. The Bureau may at any time, having regard for the same matters, direct the transfer of a prisoner from one penal or correctional facility to another. The Bureau shall make available appropriate substance abuse treatment for each prisoner the Bureau determines has a treatable condition of substance addiction or abuse.
18 U.S.C. § 3624. Release of a Prisoner
(c) Pre-release custody. — The Bureau of Prisons shall, to the extent practicable, assure that a prisoner serving a term of imprisonment spends a reasonable part, not to exceed six months, of the last 10 per centum of' the term to be served under conditions that will afford the prisoner a reasonable opportunity to adjust to and prepare for the prisoner’s re-entry into the community. The authority provided by this subsection may be used to place a prisoner in home confinement. The United States Probation System shall, to the extent practicable, offer assistance to a prisoner during such pre-release custody.