The DSAP-1 (Defense Satellite Application Program Block 1) satellites series, also known as P-35, was the first series of military meteorologal satellites of the USA. January 19, 1965 at 05:03 UTC · Launch Successful Thor MG-18 — United States Air Force, to Sun-Synchronous Orbit Space Launch Complex 10W, Vandenberg SFB, CA, USA The world's 396th orbital launch attempt, and 3rd of 1965. Data: Launch Library 2, The Space Devs.