Small satellite used to test the Vanguard three-stage launch vehicle. April 29, 1958 at 02:53 UTC · Launch Failure Vanguard — US Navy, to Low Earth Orbit Launch Complex 18A, Cape Canaveral SFS, FL, USA The world's 10th orbital launch attempt, and 7th of 1958. Data: Launch Library 2, The Space Devs. Image by NASA (NASA Image and Media Guidelines) via The Space Devs.