Discoverer 31Thor DM-21 Agena-BUnited States Air Force Launch Status Success Sun ยท Sep 17th, 1961 5:00 PM EDT LocationSpace Launch Complex 2EVandenberg AFB, CA, USA83 rockets have launched from Vandenberg AFB, CA, USA. RocketThor DM-21 Agena-BThor-Agena was a series of orbital launch vehicles.The Thor DM-21 Agena-B rocket has been launched a total of 17 times with 11 successful and 6 failed launches. AgencyUnited States Air ForceType: Government Abbreviation: USAFCountry: USA View Rocket Launch Schedule