Mr. Justice Stewart
delivered the opinion of the Court.
Appellee Robert C. Ballard is a lieutenant in the United States Navy. After more than nine years of active service as a commissioned officer, he failed, for a second time, to be selected for promotion to the grade of lieutenant commander, and was therefore subject to mandatory discharge under 10 U. S. C. § 6382 (a).1 He [500]*500brought suit in federal court claiming that if he had been a woman officer, he would have been subject to a different separation statute, 10 U. S. C. § 6401, under which he would have been entitled to 13 years of commissioned service before a mandatory discharge for want of promotion.2 He claimed that the application of § 6382 to him, when compared with the treatment of women officers subject to § 6401, was an unconstitutional discrimination based on sex in violation of the Due Process Clause of the Fifth Amendment.3
The District Judge issued a temporary restraining order prohibiting Ballard’s discharge. Subsequently, a three-judge District Court was convened to hear the claim pursuant to 28 U. S. C. §§ 2282, 2284. After hearings upon motions by the Government defendants, that court issued a preliminary injunction against Ballard’s discharge. [501]*501350 F. Supp. 167. Thereafter, the case came before the three-judge court for decision on the merits. Relying upon Frontiero v. Richardson, 411 U. S. 677, and concluding that the challenged mandatory-discharge provisions are supported solely by considerations of fiscal and administrative policy, the court held that § 6382 is unconstitutional because the 13-year tenure provision of § 6401 discriminates in favor of women without sufficient justification. 360 F. Supp. 643. Accordingly, the court enjoined the Navy from discharging Ballard for failure to be promoted to the grade of lieutenant commander before the expiration of 13 years of commissioned service. Id., at 648. We noted probable jurisdiction of this appeal from that injunctive order. 415 U. S. 912. See 28 U. S. C. § 1253.
I
At the base of the system governing the promotion and attrition of male line officers in the Navy is a congressional designation of the authorized number of the Navy’s enlisted personnel, 10 U. S. C. § 5401, and a correlative limitation upon the number of active line officers as a percentage of that figure. § 5403.4 Congress has also established the ratio of distribution of line officers in the several grades above lieutenant in fixed proportions to the total number of line officers. §§ 5442, 5447 (a).
The Secretary of the Navy is required periodically to convene selection boards to consider and recommend for promotion male fine officers in each of the separate ranks, § 5701, and must provide the boards so convened with the number of male line officers that may be recom[502]*502mended for promotion to the next higher grade. § 5756. Eligible officers are then recommended for promotion by the selection boards, based upon merit, and are placed on a promotion list and promoted in due course as vacancies occur in the higher ranks. § 5769. Because the number of lieutenant commanders is set by statute, the number of lieutenants, like Ballard, who may be recommended for promotion and placed on a promotion list in any year depends upon the number of vacancies existing and estimated for the coming year in the rank of lieutenant commander. § 5756.
Wholly separate promotion lines are established for the various categories of officers. Thus, in addition to the selection boards that are convened to review the promotion of male line officers, different selection boards are convened to recommend for promotion staff corps officers (except for women officers appointed under § 5590), § 5702, male officers in the Marine Corps, § 5703, women line officers, § 5704 (a), and women staff officers who are appointed under § 5590. § 5704 (b). The convening of these separate selection boards permits naval officers within each category to be considered for promotion in comparison with other officers with similar opportunities and experience.
Because the Navy has a pyramidal organizational structure, fewer officers are needed at each higher rank than are needed in the rank below. In the absence of some mandatory attrition of naval officers, the result would be stagnation of promotion of younger officers and disincentive to naval service. If the officers who failed to be promoted remained in the service, the promotion of younger officers through the ranks would be retarded. Accordingly, a basic “up or out” philosophy was developed to maintain effective leadership by heightening • competition for the higher ranks while providing junior [503]*503officers with incentive and opportunity for promotion. It is for this reason, and not merely because of administrative or fiscal policy considerations, that § 6382 (a) requires that lieutenants be discharged when they are “considered as having failed of selection for promotion to the grade of lieutenant commander ... for the second time.”5 Similar selection-out rules apply to officers in different ranks who are twice passed over for promotion.6
The phrase “failed of selection for promotion” in § 6382 (a) is a statutory term of art. It does not embrace all eligible officers who have been considered and not selected for promotion. Before an officer is considered to have failed of selection for the first time, he must have been placed within a “promotion zone” established by the Secretary of the Navy. The Secretary each year establishes “promotion zones” of officers who will either be selected for promotion to the next higher grade or who will be considered to have failed of selection for promotion for the first time. See §§ 5764, 5776. The number of officers in the zones, established for each grade, is set at a level to ensure a flow of promotions consistent with the appropriate terms of service in each grade, see § 5768, and to provide opportunity for promotion of others in succeeding years. The number [504]*504of officers within each zone is thus based on “a consideration of the number of vacancies estimated for the next higher grade in each of the next five years, the number of officers who will be eligible for selection in each of those years, and the terms of service that those officers will have completed.” § 5764 (a).
Section 6401 is the mandatory-attrition provision that applies to women officers appointed under § 5590, including all women line officers and most women officers in the Staff Corps.7 It provides for mandatory discharge of a woman officer appointed under § 5590 when she “is not on a promotion list” 8 and “has completed 13 years of active commissioned service in the Navy.” § 6401.
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Mr. Justice Stewart
delivered the opinion of the Court.
Appellee Robert C. Ballard is a lieutenant in the United States Navy. After more than nine years of active service as a commissioned officer, he failed, for a second time, to be selected for promotion to the grade of lieutenant commander, and was therefore subject to mandatory discharge under 10 U. S. C. § 6382 (a).1 He [500]*500brought suit in federal court claiming that if he had been a woman officer, he would have been subject to a different separation statute, 10 U. S. C. § 6401, under which he would have been entitled to 13 years of commissioned service before a mandatory discharge for want of promotion.2 He claimed that the application of § 6382 to him, when compared with the treatment of women officers subject to § 6401, was an unconstitutional discrimination based on sex in violation of the Due Process Clause of the Fifth Amendment.3
The District Judge issued a temporary restraining order prohibiting Ballard’s discharge. Subsequently, a three-judge District Court was convened to hear the claim pursuant to 28 U. S. C. §§ 2282, 2284. After hearings upon motions by the Government defendants, that court issued a preliminary injunction against Ballard’s discharge. [501]*501350 F. Supp. 167. Thereafter, the case came before the three-judge court for decision on the merits. Relying upon Frontiero v. Richardson, 411 U. S. 677, and concluding that the challenged mandatory-discharge provisions are supported solely by considerations of fiscal and administrative policy, the court held that § 6382 is unconstitutional because the 13-year tenure provision of § 6401 discriminates in favor of women without sufficient justification. 360 F. Supp. 643. Accordingly, the court enjoined the Navy from discharging Ballard for failure to be promoted to the grade of lieutenant commander before the expiration of 13 years of commissioned service. Id., at 648. We noted probable jurisdiction of this appeal from that injunctive order. 415 U. S. 912. See 28 U. S. C. § 1253.
I
At the base of the system governing the promotion and attrition of male line officers in the Navy is a congressional designation of the authorized number of the Navy’s enlisted personnel, 10 U. S. C. § 5401, and a correlative limitation upon the number of active line officers as a percentage of that figure. § 5403.4 Congress has also established the ratio of distribution of line officers in the several grades above lieutenant in fixed proportions to the total number of line officers. §§ 5442, 5447 (a).
The Secretary of the Navy is required periodically to convene selection boards to consider and recommend for promotion male fine officers in each of the separate ranks, § 5701, and must provide the boards so convened with the number of male line officers that may be recom[502]*502mended for promotion to the next higher grade. § 5756. Eligible officers are then recommended for promotion by the selection boards, based upon merit, and are placed on a promotion list and promoted in due course as vacancies occur in the higher ranks. § 5769. Because the number of lieutenant commanders is set by statute, the number of lieutenants, like Ballard, who may be recommended for promotion and placed on a promotion list in any year depends upon the number of vacancies existing and estimated for the coming year in the rank of lieutenant commander. § 5756.
Wholly separate promotion lines are established for the various categories of officers. Thus, in addition to the selection boards that are convened to review the promotion of male line officers, different selection boards are convened to recommend for promotion staff corps officers (except for women officers appointed under § 5590), § 5702, male officers in the Marine Corps, § 5703, women line officers, § 5704 (a), and women staff officers who are appointed under § 5590. § 5704 (b). The convening of these separate selection boards permits naval officers within each category to be considered for promotion in comparison with other officers with similar opportunities and experience.
Because the Navy has a pyramidal organizational structure, fewer officers are needed at each higher rank than are needed in the rank below. In the absence of some mandatory attrition of naval officers, the result would be stagnation of promotion of younger officers and disincentive to naval service. If the officers who failed to be promoted remained in the service, the promotion of younger officers through the ranks would be retarded. Accordingly, a basic “up or out” philosophy was developed to maintain effective leadership by heightening • competition for the higher ranks while providing junior [503]*503officers with incentive and opportunity for promotion. It is for this reason, and not merely because of administrative or fiscal policy considerations, that § 6382 (a) requires that lieutenants be discharged when they are “considered as having failed of selection for promotion to the grade of lieutenant commander ... for the second time.”5 Similar selection-out rules apply to officers in different ranks who are twice passed over for promotion.6
The phrase “failed of selection for promotion” in § 6382 (a) is a statutory term of art. It does not embrace all eligible officers who have been considered and not selected for promotion. Before an officer is considered to have failed of selection for the first time, he must have been placed within a “promotion zone” established by the Secretary of the Navy. The Secretary each year establishes “promotion zones” of officers who will either be selected for promotion to the next higher grade or who will be considered to have failed of selection for promotion for the first time. See §§ 5764, 5776. The number of officers in the zones, established for each grade, is set at a level to ensure a flow of promotions consistent with the appropriate terms of service in each grade, see § 5768, and to provide opportunity for promotion of others in succeeding years. The number [504]*504of officers within each zone is thus based on “a consideration of the number of vacancies estimated for the next higher grade in each of the next five years, the number of officers who will be eligible for selection in each of those years, and the terms of service that those officers will have completed.” § 5764 (a).
Section 6401 is the mandatory-attrition provision that applies to women officers appointed under § 5590, including all women line officers and most women officers in the Staff Corps.7 It provides for mandatory discharge of a woman officer appointed under § 5590 when she “is not on a promotion list” 8 and “has completed 13 years of active commissioned service in the Navy.” § 6401. Section 6401 was initially intended approximately to equate the length of service of women officers before mandatory discharge for want of promotion with that of male lieutenants discharged under § 6382 (a).9 Subsequently, however, Congress [505]*505specifically recognized that the provisions of § 6401 would probably result in longer tenure for women lieutenants than for male lieutenants under § 6382. When it enacted legislation eliminating many of the former restrictions on women officers’ participation in the naval service in 1967,10 Congress expressly left undisturbed the 13-year tenure provision of § 6401. And both the House and the Senate Reports observed that the attrition provisions governing women line officers would parallel “present provisions with respect to male officers except that the discharge of male officers probably occurs about 2 years earlier.” S. Rep. No. 676, 90th Cong., 1st Sess., 12; H. R. Rep. No. 216, 90th Cong., 1st Sess., 17 (emphasis added).11
II
It is against this background that we must decide whether, agreeably to the Due Process Clause of the [506]*506Fifth Amendment, the Congress may accord to women naval officers a 13-year tenure of commissioned service under § 6401 before mandatory discharge for want of promotion, while requiring under § 6382 (a) the mandatory discharge of male lieutenants who have been twice passed over for promotion but who, like Ballard, may have had less than 13 years of commissioned service. In arguing that Congress has acted unconstitutionally, appellee relies primarily upon the Court’s recent decisions in Frontiero v. Richardson, 411 U. S. 677, and Reed v. Reed, 404 U. S. 71.
In Frontiero the Court was concerned with “the right of a female member of the uniformed services to claim her spouse as a 'dependent’ for the purposes of obtaining increased quarters allowances and medical and dental benefits under 37 U. S. C. §§ 401, 403, and 10 U. S. C. §§ 1072, 1076, on an equal footing with male members.” 411 U. S., at 678. Under the governing statutes, a serviceman could automatically claim his spouse as a “dependent,” but a servicewoman’s male spouse was not considered to be a “dependent” unless he was shown in fact to be dependent upon his wife for more than one-half of his support. The challenged classification was based exclusively on gender, and the Government conceded that the different treatment of men and women service members was based solely upon considerations of administrative convenience. The Court found this disparity of treatment constitutionally invalid. In the words of the plurality opinion:
“[A]ny statutory scheme which draws a sharp line between the sexes, solely for the purpose of achieving administrative convenience, necessarily commands 'dissimilar treatment for men and women who are . . . similarly situated,’ and therefore involves the 'very kind of arbitrary legislative [507]*507choice forbidden by the [Constitution] . . . .’ Reed v. Reed, 404 U. S., at 77, 76. We therefore conclude that, by according differential treatment to male and female members of the uniformed services for the sole purpose of achieving administrative convenience, the challenged statutes violate the Due Process Clause of the Fifth Amendment insofar as they require a female member to prove the dependency of her husband.” Id., at 690-691.
The case of Reed v. Reed, supra, involved quite similar considerations. In that case the Court considered the constitutionality of an Idaho probate code provision that, in establishing who would administer a decedent’s estate, gave a “mandatory” preference to men over women when they were in the same degree of relationship to the decedent. The Idaho law permitted no consideration of the individual qualifications of particular men or women as potential administrators, but simply preferred males in order to reduce probate expenses by eliminating contests over the relative qualifications of men and women otherwise similarly situated. The Court held that “[b]y providing dissimilar treatment for men and women who are thus similarly situated, the challenged section violates the Equal Protection Clause.” 404 U. S., at 77.
In both Reed and Frontiero the challenged classifications based on sex were premised on overbroad generalizations that could not be tolerated under the Constitution. In Reed, the assumption underlying the Idaho statute was that men would generally be better estate administrators than women. In Frontiero, the assumption underlying the Federal Armed Services benefit statutes was that female spouses of servicemen would normally be dependent upon their husbands, while male spouses of servicewomen would not.
[508]*508In contrast, the different treatment of men and women naval officers under §§ 6382 and 6401 reflects, not archaic and overbroad generalizations, but, instead, the demonstrable fact that male and female line officers in the Navy-are not similarly situated with respect to opportunities for professional service. Appellee has not challenged the current restrictions on women officers’ participation in combat and in most sea duty. Specifically, “women may not be assigned to duty in aircraft that are engaged in combat missions nor may they be assigned to duty on vessels of the Navy other than hospital ships and transports.” 10 U. S. C. § 6015. Thus, in competing for promotion, female lieutenants will not generally have compiled records of seagoing service comparable to those of male lieutenants. In enacting and retaining § 6401, Congress may thus quite rationally have believed that women line officers had less opportunity for promotion than did their male counterparts, and that a longer period of tenure for women officers would, therefore, be consistent with the goal to provide women officers with “fair and equitable career advancement programs.” H. R. Rep. No. 216, supra, at 5. Cf. Kahn v. Shevin, 416 U. S. 351.12
[509]*509The complete rationality of this legislative classification is underscored by the fact that in corps where male and female lieutenants are similarly situated, Congress has not differentiated between them with respect to tenure. Thus women staff officers not appointed under § 5590 are subject to the same mandatory attrition rule of § 6382 (a) as are male officers. These include officers in the Medical, Dental, Judge Advocate General’s, and Medical Service Corps. See 10 U. S. C. §§ 5574, 5578, 5578a, 5579. Conversely, active male lieutenants who are members of the Nurse Corps, like female lieutenants in that Corps, are within the ambit of 10 U. S. C. § 6396 (c), which contains a 13-year tenure provision like § 6401.
[510]*510In both Reed and Frontiero the reason asserted to justify the challenged gender-based classifications was administrative convenience, and that alone. Here, on the contrary, the operation of the statutes in question results in a flow of promotions commensurate with the Navy’s current needs and serves to motivate qualified commissioned officers to so conduct themselves that they may realistically look forward to higher levels of command. This Court has recognized that “it is the primary business of armies and navies to fight or be ready to fight wars should the occasion arise.” Toth v. Quarles, 350 U. S. 11, 17. See also Orloff v. Willoughby, 345 U. S. 83, 94. The responsibility for determining how best our Armed Forces shall attend to that business rests with Congress, see U. S. Const., Art. I, § 8, els. 12-14, and with the President. See U. S. Const., Art. II, § 2, cl. 1. We cannot say that, in exercising its broad constitutional power here, Congress has violated the Due Process Clause of the Fifth Amendment.13
The judgment is reversed.