https://news.google.com/newspapers?nid=gL9scSG3K_gC&dat=19700901&printsec=frontpage&hl=en "Safeguard Test Called Successful]— Spartan 'Hits' Target Shot From 4,200 Miles Away", Pittsburgh Post-Gazette, September 1, 1970, p2 The Pentagon announced three days later that an unarmed Minuteman missile had been launched into outer space from Vandenberg Air Force Base and that the radar detected the trajectory of the rocket with enough precision to launch a Spartan missile from Kwajalein Atoll in the Marshall Islands, 4200 miles distant.