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. October 6, 1964 at 17:04 UTC · Launch Successful Thor DM-21 Ablestar — United States Air Force, to Polar Orbit Space Launch Complex 2W, Vandenberg SFB, CA, USA The world's 366th orbital launch attempt, and 73rd of 1964. Data: Launch Library 2, The Space Devs. Image via The Space Devs.