KH-4BRocket launchby USALaunch time25 May 197218:41 UTCsuccessOrbit: LEOSerial number: Thor 571Final flight of Thorad-Agena.Last Corona spacecraft.MissionRocketPayloadsRocket Thorad SLV-2H Agena-Dlaunched from Vandenberg AFB, SLC-3WUSAPayloadsNamePurposeMassCommentKH-4B (S/N 1117)Reconnaissance--