Mk.4 REVRocket launchby USALaunch time4 Dec 196005:35 UTCfailureOrbit: SuborbitalSerial number: V-2Silo elevator collapsed. Missile fell back into the silo and exploded.MissionRocketPayloadsRocket TitanIlaunched from Vandenberg AFB, OSTFUSAPayloadsNamePurposeMassCommentMk.4 REV---