Delta II

Delta II was an expendable launch system designed and built by McDonnell Douglas, part of the Delta rocket family and derived from the Delta 3000. It entered service in 1989 in two main variants, the Delta 6000 and Delta 7000, the latter with Light and Heavy subvariants. Its payloads included 24 Global Positioning System Block II satellites, several dozen NASA missions and 60 Iridium communication satellites. It flew its final mission, ICESat-2, on 15 September 2018, ending a streak of 100 consecutive successful launches, the last failure having been GPS IIR-1 in 1997. It was developed in the late 1990s into the unsuccessful Delta III.