NASA LAUNCHED A THREE-STAGE VANGUARD (SLV-7) FROM CAPE CANAVERAL, FLA. SEPTEMBER 18, 1959. DESIGNATED VANGUARD III, THE 100 POUND SATELLITE WAS USED TO STUDY THE MAGNETIC FIELD AND RADIATION BELT. VANGUARD IS U.S. NAVY PROJECT.
Vanguard 3 launch from LC-18A, Cape Canaveral Air Force Station, 0516 UTC, 18 September 1959