デルタ II
Delta II was an expendable launch system that was originally designed and built by McDonnell Douglas, and was later built by Boeing prior to the formation of ULA. Delta II was part of the Delta rocket family and entered service in 1989. Delta II vehicles included the Delta 6000 and the two later Delta 7000 variants ("Light" and "Heavy"). The rocket flew its final mission ICESat-2 on 15 September 2018.