The DSAP-2 (Defense Satellite Application Program Block 2) satellites series consisted of three modified DSAP-1 military meteorological satellites. September 10, 1965 at 04:41 UTC · Launch Successful Thor Burner 1 — United States Air Force, to Sun-Synchronous Orbit Space Launch Complex 10W, Vandenberg SFB, CA, USA The world's 475th orbital launch attempt, and 82nd of 1965. Data: Launch Library 2, The Space Devs.