KH-4BRocket launchby USALaunch time4 Mar 197022:15 UTCsuccessOrbit: LEOSerial number: Thor 551MissionRocketPayloadsRocket Thorad SLV-2H Agena-Dlaunched from Vandenberg AFB, SLC-3WUSAPayloadsNamePurposeMassCommentKH-4B (S/N 1109)Reconnaissance--