The last launch under the Discoverer cover name was Discoverer 38 on 26 February 1962. Its bucket was successfully recovered in midair during the 65th orbit (the 13th recovery of a bucket; the ninth one in midair). Following this last use of the Discoverer name, the remaining launches of Corona satellites were entirely TOP SECRET. The last Corona launch was on 25 May 1972. The project ended when Corona was replaced by the KH-9 Hexagon program. The best sequence of Corona missions was from 1966 to 1971, when there were 32 consecutive successful missions, including film recoveries.