The OV2 (Orbiting Vehicle 2) series satellites were originally built for project ARENTS (Advanced Research Environmental Test Satellite), which was intended to obtain supporting data for the Vela program. After the cancellation of the ARENTS program, the already built hardware was reused for OV2, a low-cost series of experimental satellites, which were to be launched for free on Titan-3C test flights to very different orbits. December 21, 1965 at 14:00 UTC · Launch Successful Titan IIIC — United States Air Force, to Elliptical Orbit Space Launch Complex 41, Cape Canaveral SFS, FL, USA The world's 512th orbital launch attempt, and 119th of 1965. Data: Launch Library 2, The Space Devs. Image by U.S. DoD (Department of Defense Image Use Policy) via The Space Devs.