O'Callahan v. Parker
395 U.S. 258 · Decided June 2, 1969 · Supreme Court of the United States
Record summary. This page is generated from the Supreme Court Database’s coded data about the case. It describes who decided what, not the Court’s reasoning. Read the opinion itself before relying on it. Not legal advice.
At a glance
O'Callahan v. Parker was decided on June 2, 1969 by a vote of 5–3. The Court reversed the lower court's decision. Justice William O. Douglas wrote the opinion of the Court. SCDB classifies its main issue as “Military, active duty” in the Civil Rights area. SCDB records that the Court declared an act of Congress unconstitutional.
Read the opinion
Case details
- Citations
- 395 U.S. 258 · 89 S. Ct. 1683 · 23 L. Ed. 2d 291 · 1969 U.S. LEXIS 1436
- Docket number
- 646
- Decided
- June 2, 1969
- Argued
- January 23, 1969
- Court era
- Warren Court
- Decision type
- Opinion of the Court (orally argued)
- Disposition
- Reversed
- Outcome for petitioner
- The petitioning party received a favorable disposition
- Vote
- 5–3
- Majority opinion
- William O. Douglas
- Opinion assigned by
- Earl Warren
- How the case arrived
- Certiorari
- Issue (SCDB)
- Military, active duty
- Issue area
- Civil Rights
- Legal provision
- Uniform Code of Military Justice
- Type of law
- Federal statute
- Held unconstitutional
- An act of Congress
- Decision direction (SCDB)
- Liberal what this means
How the Justices voted
| Justice | Vote | Separate writing |
|---|---|---|
| Justice Hugo L. Black | Majority | |
| Justice William O. Douglas | Majority | Wrote an opinion |
| Chief Justice Earl Warren | Majority | |
| Justice John M. Harlan II | Dissent | Wrote an opinion |
| Justice William J. Brennan Jr. | Majority | |
| Justice Potter Stewart | Dissent | |
| Justice Byron R. White | Dissent | |
| Justice Thurgood Marshall | Majority |
Full case caption
O'Callahan v. Parker, Warden
SCDB identifiers: case 1968-114, docket 1968-114-01.
Related decisions
Other cases on “Military, active duty”
- United States v. Augenblick
- Relford v. Commandant, U.S. Disciplinary Barracks, Ft. Leavenworth
- California v. Buzard
- Snapp v. Neal
- Cass v. United States
- Parker v. Levy
Cases on the same legal provision: Uniform Code of Military Justice
Same Term, same area (Civil Rights)
- Williams v. RhodesLaw held unconstitutional
- Oestereich v. Selective Service System Local Board No. 11
- United States v. Augenblick
- Gardner v. California
- Hunter v. EricksonLaw held unconstitutional
- Alabama State Teachers Assn. v. Alabama Public School and College Authority
Source: Supreme Court Database, 2026 Release 01 (data file dated September 8, 2026). Imported into CaseTrail November 5, 2026. Coverage: decisions from the 1946 through 2025 Terms. Methodology · Report an error