MRPV (Multi Research Payload Vehicle) was a satellite which carried 21 experiments for the USAF. September 2, 1965 at 20:00 UTC · Launch Failure Thor SLV-2 Agena D — United States Air Force, to Low Earth Orbit Space Launch Complex 1E, Vandenberg SFB, CA, USA The world's 472nd orbital launch attempt, and 79th of 1965. Data: Launch Library 2, The Space Devs. Image by USAF via The Space Devs.