KH-4BRocket launchby USALaunch time1 May 196821:31 UTCsuccessOrbit: LEOSerial number: Thor 511MissionRocketPayloadsRocket Thorad SLV-2G Agena-Dlaunched from Vandenberg AFB, SLC-3WUSAPayloadsNamePurposeMassCommentKH-4B (S/N 1103)/SRV S/N 807Reconnaissance--