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, 1964 at 10:59 UTC · Launch Successful Thor SLV-2 Agena D — United States Air Force, to Sun-Synchronous Orbit Space Launch Complex 2W, Vandenberg SFB, CA, USA The world's 295th orbital launch attempt, and 2nd of 1964. Data: Launch Library 2, The Space Devs. Image by USAF via The Space Devs.