Name: OV1-20/21 — launch
Start: 1971-08-07
Location: Vandenberg AFB, California

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

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)

1969-03-18 OV1-17/18/19 — launch Shares a spacecraft, person or other linked entity
1968-04-06 OV1-13/14 — launch Shares a spacecraft, person or other linked entity
1968-07-11 OV1-15/16 — launch Shares a spacecraft, person or other linked entity
1971-01-21 KH-8A — launch Same organization: USAF Space and Missile Systems Organization
1971-03-21 OPS 4788 — launch Same organization: USAF Space and Missile Systems Organization
1971-03-24 CORONA 142/1114 — launch Same organization: USAF Space and Missile Systems Organization