Name: Discoverer 31 — launch
Start: 1961-09-17
Location: Vandenberg AFB, California

Launch code: OS. Source references: VCR; -.

Jonathan McDowell — General Catalog of Artificial Space Objects (opens in a new tab) — Data from GCAT (J. McDowell, planet4589.org/space/gcat), CC BY 4.0. Adapted into anniversary records. (CC BY 4.0)

1961-11-05 Discoverer 34 — launch Shares a spacecraft, person or other linked entity
1961-10-13 Discoverer 32 — launch Shares a spacecraft, person or other linked entity
1961-12-12 Discoverer 36 — launch Shares a spacecraft, person or other linked entity
1961-10-21 Midas 4 — launch Same organization: US Air Force Space Systems Division
1961-11-15 Transit 4B — launch Same organization: US Air Force Space Systems Division
1961-12-22 Samos 5 — launch Same organization: US Air Force Space Systems Division