419 U.S. 498 (1975)
Robert C. Ballard served more than nine years as a commissioned officer in the United States Navy.1 After failing twice to be selected for promotion to lieutenant commander, he became subject to mandatory discharge under 10 U.S.C. § 6382(a).2 Ballard filed suit in federal district court claiming that a woman officer in his position would have been entitled to thirteen years of commissioned service before mandatory discharge under 10 U.S.C. § 6401.3 He asserted that applying the shorter tenure rule to him amounted to unconstitutional discrimination based on sex.4
The district court first issued a temporary restraining order blocking Ballard’s discharge.5 A three-judge district court was convened under 28 U.S.C. §§ 2282 and 2284.6 After hearings on motions by the government defendants, the three-judge court granted a preliminary injunction.7 Thereafter, the case came before the three-judge court for decision on the merits, after which 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.8 The Supreme Court noted probable jurisdiction of the government’s appeal.9
The Navy operates separate promotion systems for male line officers and for women officers appointed under 10 U.S.C. § 5590.10 Male lieutenants are discharged upon twice failing selection for promotion to lieutenant commander.11 Women officers appointed under § 5590 are discharged after thirteen years of active commissioned service if not on a promotion list.12 Congress first enacted the thirteen-year provision as part of the Women’s Armed Services Integration Act of 1948 and retained it when passing 1967 legislation that removed many prior restrictions on women officers’ careers.13
Women line officers may not be assigned to combat aircraft or to vessels other than hospital ships and transports under 10 U.S.C. § 6015.14 In the Medical, Dental, Judge Advocate General’s, and Medical Service Corps, where men and women serve under the same conditions, both are subject to the same attrition rule.15 The Navy maintains a pyramidal rank structure that requires periodic attrition to prevent stagnation in promotions and to preserve incentives for junior officers.16
Whether the application of 10 U.S.C. § 6382(a) to male naval lieutenants who have twice failed selection for promotion, when compared with the treatment of women officers under 10 U.S.C. § 6401, violates the Due Process Clause of the Fifth Amendment?17
Under the Due Process Clause of the Fifth Amendment, gender-based classifications are unconstitutional when premised on overbroad generalizations, as held in Reed v. Reed and Frontiero v. Richardson; however, classifications survive when they reflect demonstrable differences in professional opportunities available to male and female officers rather than administrative convenience alone.18
No. The classification does not violate the Due Process Clause because the statutes reflect real differences in service opportunities rather than overbroad generalizations.19 The separate promotion systems and the combat restrictions under section 6015 establish that male and female line officers are not similarly situated.20 Congress could rationally conclude that the thirteen-year tenure under section 6401 provides fair advancement opportunities given those restrictions.21 Unlike the administrative-convenience justifications rejected in Reed and Frontiero, the tenure rules here advance the Navy’s need for an effective up-or-out promotion system within a pyramidal structure while accounting for actual assignment limitations.22
The same attrition rule applies in corps where men and women serve under identical conditions, confirming that the distinction tracks real differences in opportunity.23
The application of 10 U.S.C. § 6382(a) to male naval lieutenants such as Ballard does not violate the Due Process Clause of the Fifth Amendment.24
Related opinions on this issue
Joined by Justices Douglas And Marshall
Justice Brennan dissented on the ground that gender-based classifications require close judicial scrutiny and can be sustained only upon a showing of compelling governmental interests that cannot be achieved by other means.25 He found no evidence in the statutory scheme or legislative history that Congress intended the thirteen-year tenure to compensate women for limited opportunities.26 Instead, the 1967 amendments aimed at parity by removing restrictions and applying the same rules to both sexes. Brennan noted that the executive branch itself viewed the separate rule as no longer needed, undermining any claim of overriding interest.27
He concluded that the classification served no compelling purpose and would have affirmed the district court judgment.28
Justice White filed a separate dissenting opinion. He agreed for the most part with Justice Brennan’s analysis of the statutory scheme and the lack of any compelling governmental interest justifying the gender-based distinction in tenure provisions.29 Justice White likewise dissented from the judgment of the Court.