The Transit-O series of satellites that closely followed the design of Transit 5C-1 were also called “Oscars” (Oscar is the phonetic alphabet for “O”, i. e., operational). They were also called NNS (Navy Navigation Satellite) or shortened NavSat. June 24, 1965 at 22:35 UTC · Launch Successful Thor DM-21 Ablestar — United States Air Force, to Polar Orbit Space Launch Complex 2E, Vandenberg SFB, CA, USA The world's 447th orbital launch attempt, and 54th of 1965. Data: Launch Library 2, The Space Devs. Image via The Space Devs.