Senior Judge EVERETT
delivered the opinion of the Court.
Appellant, Airman First Class Scott E. Falk, United States Air Force, was tried by military judge alone at a general court-martial convened at Travis Air Force Base, California, on October 7, 1996. Pursuant to his pleas, Falk was found guilty of 2 specifications of conspiracy to commit larceny, larceny, making a false claim, larceny of mail matter, and possessing child pornography, in violation of Articles 81, 121, 132, and 134, Uniform Code of Military Justice, 10 USC §§ 881, 921, 932, and 934, respectively. The military judge sentenced Falk to a dishonorable discharge, confinement for 42 months, total forfeitures, and reduction to the lowest enlisted grade. The convening authority approved the sentence, and the Court of Criminal Appeals affirmed the findings and sentence.
We granted review of these issues:
I
WHETHER APPELLANT’S PLEA TO SPECIFICATION 1, CHARGE I, WAS PROVIDENT IN THAT HIS CONDUCT WAS NOT IN VIOLATION OF 18 USC § 2252 BECAUSE HE DID NOT POSSESS THREE OR MORE BOOKS, MAGAZINES, PERIODICALS, FILMS, VIDEO TAPES, OR OTHER MATTER WHICH CONTAINED ILLEGAL IMAGES.
II
WHETHER THE APPLICATION OF ARTICLES 57(a) AND 58b, UCMJ, VIOLATES THE EX POST FACTO CLAUSE OF THE UNITED STATES CONSTITUTION WITH RESPECT TO APPELLANT.
The first issue concerns the child pornography charge and poses two questions. One is whether appellant’s guilty plea was improvident because of the great confusion on the part of all involved — including the Article 321 investigating officer, counsel, the military judge, and later, appellate counsel— about the statute under which appellant was being tried. The second question is whether any statute in effect at the time of Falk’s alleged misconduct prohibited what he did. To understand and answer the two questions requires the consideration of several statutes and then an examination of this case’s confusing procedural history.
I
A. Statutes Involved
Article 134 of the UCMJ prohibits conduct of a servicemember which is: (a) to the prejudice of good order and discipline in the armed forces; (b) service discrediting; or (c) a crime under generally applicable federal penal statutes. Some conduct that falls into one or both of the first two categories may also be a crime under Title 18 of the United States Code; and in that event, the conduct is punishable whether committed by a ser-vicemember or a civilian. Therefore, an accuser in preferring charges, or trial counsel in prosecuting, may opt to rely on the generally applicable federal penal statute rather than to proceed under the first two clauses of Article 134. In that way, there is no need to prove that the accused’s conduct was contrary to good order and discipline or was service discrediting.
Title 18 USC contains § 2252, which Congress enacted in 1978, and which has been subsequently amended from time to time. At the time of Falk’s trial and alleged offense, § 2252 provided, inter alia, that it was a crime to “knowingly possess 3 or more books, magazines, periodicals, films, video tapes, or other matter which contain any visual depiction” of child pornography.2
[387]*387Effective on September 30,1996, Congress added to Title 18 an additional section, § 2252A, which made it a crime to “possess[ ] ... any book, magazine, periodical, film, videotape, computer disk, or any other material that contains 3 or more images of child pornography.”3 At the time, no change was made in § 2252(a); instead § 2252A was a new section added to supplement the existing provisions of Title 18. Presumably, it was designed to encompass some additional means of possessing child pornography that were not already covered by existing statutes; otherwise, there would have been no need to add a new section to Title 18. The failure of some of those involved in this case to recognize that 18 USC § 2252 was supplemented — rather than replaced or amended— by the enactment of § 2252A is one source of the apparent confusion in the review of this ease.
B. Procedural History
In the Spring of 1996, the Air Force Office of Special Investigations (OSI) conducted a criminal investigation of Falk as a result of larceny allegations. During this investigation, Falk’s wife informed the OSI that Falk had stored on the hard drive of his computer numerous pictures of children engaging in sexually explicit conduct. A search warrant was executed, and on June 5, 1996, 126 images depicting minors engaging in various sex acts were downloaded from Falk’s computer hard drive. Before downloading the images from Falk’s computer, investigators found several computer directories that contained images of child pornography. Most of these images were filed in a directory entitled “pre-teen.” The minors who were depicted while engaged in child pornography were ages 6 to 16.
Charges were originally preferred against Falk on July 2, 1996, pursuant to RCM 307, Manual for Courts-Martial, United States (1995 ed.). At that time, Charge I consisted of a single specification, which read:
Violation of the UCMJ, Article 134 ... Specification: In that AIRMAN FIRST CLASS SCOTT E. FALK, United States Air Force, 60th Aircraft Generation Squadron, did, at Travis Air Force Base, California, on or about 5 June 1996, knowingly possess three or more pictures which contain a visual depiction involving the use of a minor engaging in sexually explicit conduct and such visual depiction is of such conduct, on land or a building owned by or otherwise under the control of the Government of the United States, to wit: 9 Van-denberg Court, Travis Air Force Base, California.
Presumably, appellant was being charged at that point with violating one or both of the first two clauses of Article 134, conduct prej[388]*388udicial to good order and discipline or service discrediting. In any event, nothing in the specification referred to § 2252 or to any other section of Title 18; nor did it in any way allege that the third clause of Article 134 had been violated.
A little more than 1 month later, on August 14, 1996, a report was submitted by the officer who had conducted the investigation required by Article 32.4 As to Charge I, which concerned child pornography, the report recommended that
Specification 1 of Charge I should make reference to 18 USC § 2252 as being the specific United States Code which was allegedly violated by A1C Falk.
A copy of § 2252 was an exhibit to the investigating officer’s report, so that anyone reading the report would have ready access to the statute it cited.
Since Charge II in the original charge sheet also alleged that Falk violated Article 134, by stealing some credit cards from the mail, the investigating officer also recommended that
Charge I should consist of two specifications, the first regarding the possession of child pornography, and the second specification in violation of Art 134 should be what is currently the specification of Charge II.
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Senior Judge EVERETT
delivered the opinion of the Court.
Appellant, Airman First Class Scott E. Falk, United States Air Force, was tried by military judge alone at a general court-martial convened at Travis Air Force Base, California, on October 7, 1996. Pursuant to his pleas, Falk was found guilty of 2 specifications of conspiracy to commit larceny, larceny, making a false claim, larceny of mail matter, and possessing child pornography, in violation of Articles 81, 121, 132, and 134, Uniform Code of Military Justice, 10 USC §§ 881, 921, 932, and 934, respectively. The military judge sentenced Falk to a dishonorable discharge, confinement for 42 months, total forfeitures, and reduction to the lowest enlisted grade. The convening authority approved the sentence, and the Court of Criminal Appeals affirmed the findings and sentence.
We granted review of these issues:
I
WHETHER APPELLANT’S PLEA TO SPECIFICATION 1, CHARGE I, WAS PROVIDENT IN THAT HIS CONDUCT WAS NOT IN VIOLATION OF 18 USC § 2252 BECAUSE HE DID NOT POSSESS THREE OR MORE BOOKS, MAGAZINES, PERIODICALS, FILMS, VIDEO TAPES, OR OTHER MATTER WHICH CONTAINED ILLEGAL IMAGES.
II
WHETHER THE APPLICATION OF ARTICLES 57(a) AND 58b, UCMJ, VIOLATES THE EX POST FACTO CLAUSE OF THE UNITED STATES CONSTITUTION WITH RESPECT TO APPELLANT.
The first issue concerns the child pornography charge and poses two questions. One is whether appellant’s guilty plea was improvident because of the great confusion on the part of all involved — including the Article 321 investigating officer, counsel, the military judge, and later, appellate counsel— about the statute under which appellant was being tried. The second question is whether any statute in effect at the time of Falk’s alleged misconduct prohibited what he did. To understand and answer the two questions requires the consideration of several statutes and then an examination of this case’s confusing procedural history.
I
A. Statutes Involved
Article 134 of the UCMJ prohibits conduct of a servicemember which is: (a) to the prejudice of good order and discipline in the armed forces; (b) service discrediting; or (c) a crime under generally applicable federal penal statutes. Some conduct that falls into one or both of the first two categories may also be a crime under Title 18 of the United States Code; and in that event, the conduct is punishable whether committed by a ser-vicemember or a civilian. Therefore, an accuser in preferring charges, or trial counsel in prosecuting, may opt to rely on the generally applicable federal penal statute rather than to proceed under the first two clauses of Article 134. In that way, there is no need to prove that the accused’s conduct was contrary to good order and discipline or was service discrediting.
Title 18 USC contains § 2252, which Congress enacted in 1978, and which has been subsequently amended from time to time. At the time of Falk’s trial and alleged offense, § 2252 provided, inter alia, that it was a crime to “knowingly possess 3 or more books, magazines, periodicals, films, video tapes, or other matter which contain any visual depiction” of child pornography.2
[387]*387Effective on September 30,1996, Congress added to Title 18 an additional section, § 2252A, which made it a crime to “possess[ ] ... any book, magazine, periodical, film, videotape, computer disk, or any other material that contains 3 or more images of child pornography.”3 At the time, no change was made in § 2252(a); instead § 2252A was a new section added to supplement the existing provisions of Title 18. Presumably, it was designed to encompass some additional means of possessing child pornography that were not already covered by existing statutes; otherwise, there would have been no need to add a new section to Title 18. The failure of some of those involved in this case to recognize that 18 USC § 2252 was supplemented — rather than replaced or amended— by the enactment of § 2252A is one source of the apparent confusion in the review of this ease.
B. Procedural History
In the Spring of 1996, the Air Force Office of Special Investigations (OSI) conducted a criminal investigation of Falk as a result of larceny allegations. During this investigation, Falk’s wife informed the OSI that Falk had stored on the hard drive of his computer numerous pictures of children engaging in sexually explicit conduct. A search warrant was executed, and on June 5, 1996, 126 images depicting minors engaging in various sex acts were downloaded from Falk’s computer hard drive. Before downloading the images from Falk’s computer, investigators found several computer directories that contained images of child pornography. Most of these images were filed in a directory entitled “pre-teen.” The minors who were depicted while engaged in child pornography were ages 6 to 16.
Charges were originally preferred against Falk on July 2, 1996, pursuant to RCM 307, Manual for Courts-Martial, United States (1995 ed.). At that time, Charge I consisted of a single specification, which read:
Violation of the UCMJ, Article 134 ... Specification: In that AIRMAN FIRST CLASS SCOTT E. FALK, United States Air Force, 60th Aircraft Generation Squadron, did, at Travis Air Force Base, California, on or about 5 June 1996, knowingly possess three or more pictures which contain a visual depiction involving the use of a minor engaging in sexually explicit conduct and such visual depiction is of such conduct, on land or a building owned by or otherwise under the control of the Government of the United States, to wit: 9 Van-denberg Court, Travis Air Force Base, California.
Presumably, appellant was being charged at that point with violating one or both of the first two clauses of Article 134, conduct prej[388]*388udicial to good order and discipline or service discrediting. In any event, nothing in the specification referred to § 2252 or to any other section of Title 18; nor did it in any way allege that the third clause of Article 134 had been violated.
A little more than 1 month later, on August 14, 1996, a report was submitted by the officer who had conducted the investigation required by Article 32.4 As to Charge I, which concerned child pornography, the report recommended that
Specification 1 of Charge I should make reference to 18 USC § 2252 as being the specific United States Code which was allegedly violated by A1C Falk.
A copy of § 2252 was an exhibit to the investigating officer’s report, so that anyone reading the report would have ready access to the statute it cited.
Since Charge II in the original charge sheet also alleged that Falk violated Article 134, by stealing some credit cards from the mail, the investigating officer also recommended that
Charge I should consist of two specifications, the first regarding the possession of child pornography, and the second specification in violation of Art 134 should be what is currently the specification of Charge II.
The investigating officer’s report contained a section concerned with “elements of the offenses.” Among the elements listed for Charge I — the child pornography charge— were that the conduct be in violation of either or both of the first two clauses of Article 134. However, the discussion of the “elements” contained no recommendation that the specification under Charge I be amended to include allegations that Falk’s conduct had been contrary to good order and discipline or service discrediting; nor did it refer to the report’s recommendation or to § 2252.
At some time within the next 12 days, the words “in violation of § 2252” were added to what had been changed to specification 1 of Charge I in order to comply with the investigating officer’s recommendation. The handwritten modification is initialed “LS,” who we assume is Captain (CPT) Lara R. Stutz, assistant trial counsel.
Then, on August 26, 1996, the staff judge advocate sent the convening authority a pretrial advice memorandum in accordance with RCM 406. The memorandum acknowledged the recommendation by the investigating officer to add § 2252 to the charge sheet. The memorandum also alerted the convening authority to the fact that the changes had already been made at the “Wing level,” and recommended that,
with regard to the original specification of Charge I, ... the word “each” be inserted after the word “which” and before the word “contain,” the words “the production of which involved” be substituted for the word “involving.”
The next day, August 27, 1996, the convening authority referred the charges in accordance with RCM 601 and approved the foregoing modifications to the charge sheet. Again, handwritten modifications were made, but this time by “RD.” We can only speculate that “RD” is CPT Robin Donato, trial counsel in the ease. The final version of Specification 1 of Charge I read as follows:
knowingly possess three or more pictures which contain a visual depiction the production of which involved the use of a minor engaging in sexually explicit conduct and such visual depiction is of such conduct, on land or a building owned by or otherwise under the control of the Government of the United States, to wit: 9 Van-denberg Court, Travis Air Force Base, California, in violation of 18 USC § 2252.
Sometime around September 4, 1996, defense counsel received a copy of a document purporting to contain the charges that had been referred, together with the advice of the staff judge advocate. However, defense counsel’s copy of the charge sheet did not include the modifications directed by the convening authority. On approximately September 26, 1996, after the Government discovered its error, an accurate copy of the charge [389]*389sheet, as it had been modified, was sent to the defense counsel.
When a pretrial session was held pursuant to ROM 802, the trial counsel described in this manner the history of the charges on which Falk was to be tried:
Charge I, Specification 1, the change is striking the word “involving” and adding “the production of which involved” was made at referral. Adding at the end “in violation of 18 USC 2252.” This change to Charge I, Specification 1, was made to a copy of the charge sheet based on the recommendation of the Investigating Officer, probably improperly, Your Honor, by this office when we were preparing the Article 32 package for the numbered Air Force. When the numbered Air Force prepared the Pretrial Advice for the Convening Authority, they assumed these changes were made on the original charge sheet and adopted them in their pretrial advice. Two weeks ago we discovered this change was not made to the original charge sheet which was served on the Accused on 30 August 1996. Therefore, I made the pen and ink change and faxed it to Captain Hatch, the Accused’s Defense Counsel, on 26 September 1996.
Prior to Falk’s trial, which took place on October 7, 1996, the trial counsel provided the military judge with proposed instructions on the elements of specification 1 of Charge I — the specification which concerns child pornography. These instructions conformed much more to the language of § 2252A— which had not been enacted at the time of the alleged crime — than to the language of § 2252.5 However, attached to the proposed instructions was a copy of § 2252. During the providence inquiry, the military judge did not use the language of § 2252 but gave an explanation of specification 1, Charge I, in terms that followed the proposed instructions provided by trial counsel. With that explanation before him, and having previously entered into a stipulation of fact, Falk entered his plea of guilty.
II
A. The Plea was Improvident
On appeal, Falk claims that his plea was improvident — because it was based on a misunderstanding of the law as a result of the military judge’s misleading explanation and because the facts stipulated to did not establish guilt under the statute in effect at the time. In connection with his second contention, Falk emphasizes that he stipulated to possession of only a single computer containing many images in its hard drive, and that § 2252A was not enacted until long after charges had been preferred. The Government not only disputes appellant’s contention that his conduct was not a crime under the statute then in effect, but also insists that his guilty plea waived any rights he might otherwise have to raise any issue as to the adequacy of the stipulated facts to establish that an offense had been committed under § 2252. The Court of Criminal Appeals accepted the Government’s view that a waiver had occurred.
We “will not ‘speculate post-trial as to the existence of facts which might invalidate an appellant’s guilty pleas.’ ” United States v. Faircloth, 45 MJ 172, 174 (1996) (quoting United States v. Johnson, 42 MJ 443, 445 (1995)). However, “[i]n determining the providence of [an] appellant’s pleas, it is un-controverted that an appellate court must consider the entire record in a ease.” Johnson, supra at 445 (citing United States v. Bester, 42 MJ 75 (1995)).
From the recitation of the events that led up to Falk’s plea of guilty, it is apparent that great confusion existed with respect to the elements that constituted the crime with which Falk was charged. The military judge advised Falk pursuant to the instructions proposed by trial counsel; and those instructions, although corresponding substantially to the allegations of the specification as it had been amended prior to trial, did not match well with the provisions of § 2252.6 Obvious[390]*390ly, the trial counsel had not noticed the discrepancy when he attached a copy of § 2252 to the instructions; nor did the military judge when he gave the instructions — apparently without comparing them with the language of the statute. Additional confusion arises because, only a week before trial, § 2252A was enacted, whose provisions fit much more closely the facts stipulated to by Falk than did the provisions of § 2252. Whether the trial counsel was even aware of the statute so recently enacted is questionable. However, appellate defense counsel have properly complained that Falk was convicted under a statute that did not exist at the time of his alleged offense.
In any event, the picture of confusion that is painted by the record leads us to the conclusion that, in fairness, the plea must be held improvident and the conviction set aside. Indeed, to hold that the plea was provident could hardly conform with the premise that an accused who pleads guilty has some understanding of why the facts he has admitted establish his guilt. Even if the evidence had been sufficient to establish guilt, that circumstance would not be sufficient to compel the conclusion that Falk’s plea was provident.
B. The Stipulated Facts abe Insufficient to Establish Guilt
When a guilty plea is held improvident, the question presents itself whether the Government can thereafter obtain a conviction in a contested trial. To us, it is apparent from the stipulated facts that, if a trial were held, the evidence would be insufficient to establish guilt under § 2252; and for this reason as well, the plea of guilty was improvident.7
We reject the Government’s contention that the language of § 2252 embraces the conduct admitted by Falk. In interpreting § 2252, we must look first to the plain language of the statute and construe its provisions in terms of its object and policy, as well as the provisions of any related statutes, in order to ascertain the intent of Congress; if the statute is unclear, we look next to the legislative history. See United States v. Hockings, 129 F.3d 1069, 1071 (9th Cir.1997) (citing Northwest Forest Resource Council v. Glickman, 82 F.3d 825, 830 (9th Cir.1996)); see also United States v. Scranton, 30 MJ 322, 324 (CMA 1990) (citing Ladner v. United States, 358 U.S. 169, 173, 79 S.Ct. 209, 3 L.Ed.2d 199 (1958)); Bell v. United States, 349 U.S. 81, 75 S.Ct. 620, 99 L.Ed. 905 (1955). In the process, absent evidence to the contrary, the ordinary meaning of the words used expresses the legislative intent. See, e.g., United States v. Inthavong, 48 MJ 628, 631 (Army Ct.Crim.App.1998) (citing United States v. Easter, 981 F.2d 1549, 1558 (10th Cir.1992)). The interpretation of a statute and its legislative history is a question of law to be reviewed de novo. See Quiban v. United States Veterans Administration, 724 F.Supp. 993, 1001 (D.D.C.1989); see also Hockings, supra at 1070; United States v. Weatherspoon, 49 MJ 209 (1998).
The Government has made the argument that the reference in § 2252 to “3 or more books, magazines, periodicals, films, video tapes, or other matter which contain any visual depiction” makes criminal Falk’s possession of 126 images on one computer hard drive.8 We disagree. A computer hard [391]*391drive is more analogous to a single “book,” which contains many chapters, words, and images.9
Section 2252 requires the possession of three or more “matters” which “contain” one or more visual depictions. The word “contain” suggests that the visual depiction must have some sort of host, such as a hard copy picture, or a book, or even a computer disk. Therefore, a person may be convicted under § 2252 for possessing 3 or more photographs, but may not be convicted for possessing 1 book with 20 pictures of child pornography in it. Whether Congress foresaw this result, we are unaware. Perhaps the premise was that someone in possession of 3 pictures, separately acquired, had a more serious interest in pornography — and so presented a greater danger to children — than someone who acquired a single book or magazine that contained several pornographic pictures. Perhaps § 2252 was worded to prevent the prosecution of someone in unwitting possession of a single book with many pictures depicting child pornography. In any event, the language of § 2252 calls for this interpretation.
Furthermore, the legislative history supports our conclusion because it shows that § 2252A was added to Title 18 in order to clear up the ambiguities and omissions in coverage that arise from the most obvious construction of § 2252. Congress’ purpose underlying § 2252 was to “prohibit the sexual exploitation of children,” in general; Congress’ intent in adding § 2252A to Title 18 was because it was “needed,” as reflected in this statement made when the bill which later became § 2252A was introduced:
This legislation is needed due to technological advances in the recording, creation, alteration, production, distribution and transmission of visual images and depictions, particularly through the use of computers.
S.Rep. No. 358, 104th Cong., 2d Sess., 1996 WL 506545 at p. 9, and in:
Current law prohibits the possession of three or more books, magazines, periodicals, films, video tapes or other material which contains any visual depiction of a minor engaging in sexually explicit conduct. Since a single computer disk is capable of storing hundreds of child pornographic images, current law effectively permits the possession of substantial collections of child pornography, a loophole that will be closed under this section.
Id. at 12.
We do not dispute that, in some cases, “Congress may amend a statute simply to clarify existing law, to correct a misinterpretation, or to overrule wrongly decided cases,” and that, in turn, “an amendment to a statute does not necessarily indicate that the unamended statute mean[t] the opposite.” Hackings, 129 F.3d at 1072 (quoting Hawkins v. United States, 30 F.3d 1077,1082 (9th Cir.1994)). We do, however, disagree with the Government’s position that § 2252A was enacted only for clarification. The language in the legislative history clearly shows that Congress’ purpose was to close the “loophole” through which Falk has fallen. While we have no fondness for “loopholes” which allow one to avoid responsibility for one’s behavior, our system of law does not allow anyone to be convicted of a crime under a law enacted after the fact, or to plead guilty to a ciime not supported by the admitted facts.
Even if § 2252 may appear ambiguous and open to more than one interpretation, we will not expand the scope of this criminal statute beyond the meaning an average citizen would understand and attribute to its plain lan[392]*392guage. See McBoyle v. United States, 283 U.S. 25, 51 S.Ct. 340, 75 L.Ed. 816 (1931). As the Supreme Court has stated:
Although it is not likely that a criminal will carefully consider the text of the law before he murders or steals, it is reasonable that a fair warning should be given to the world in language that the common world will understand, of what the law intends to do if a certain line is passed. To make the warning fair, so far as possible the line should be clear.
Id. at 27, 51 S.Ct. 340.
We conclude that a computer hard drive is a “disk,” according to commonly used language, and constitutes a single “matter” for purposes of § 2252.10 Even if many images of pornography are contained in a single hard drive, § 2252 has not been violated; and a single hard drive with three or more images is a single “matter.” We hold, therefore, that Falk’s conduct is not punishable under § 2252 — even though if the same conduct had occurred after the enactment of § 2252A, on September 30, 1996, it would have been punishable under the later statute. For lack of a “substantial basis” in law, Falk’s guilty plea must be set aside. See United States v. Prater, 32 MJ 433, 436 (CMA 1991).
III
Regarding Issue II, we note that all of Falk’s remaining offenses were committed between May and December 1995, well before the effective date of the amendment to Article 57(a). In addition, his sentence included total forfeitures, so Article 58b does not apply. See United States v. Saia, 48 MJ 461 (1998). Thus, appellant is entitled to relief under United States v. Gorski, 47 MJ 370 (1997).
IV
The decision of the United States Air Force Court of Criminal Appeals is reversed as to specification 1 of Charge I and the sentence. The finding of guilty to specification 1 of Charge I and the sentence are set aside. The record of trial is returned to the Judge Advocate General of the Air Force. A rehearing on specification 1 of Charge I and the sentence may be ordered.
Execution of the forfeitures and reduction prior to the date of the convening authority’s action are hereby declared to be without legal effect. Any forfeitures collected prior to that date, and any pay and allowances withheld because of the premature reduction in grade, will be restored. This matter is also referred to the Judge Advocate General of the Air Force for appropriate action.