KH-4BRocket launchby USALaunch time19 Apr 197221:43 UTCsuccessOrbit: LEOSerial number: Thor 569MissionRocketPayloadsRocket Thorad SLV-2H Agena-Dlaunched from Vandenberg AFB, SLC-3WUSAPayloadsNamePurposeMassCommentKH-4B (S/N 1116)Reconnaissance--