United Launch Alliance's Delta IV launch vehicle. Delta IV began development in the 1990s under McDonnell Douglas for the USAF's Evolved Expendable Launch Vehicle program, then became a Boeing property after those companies merged, and finally came to be operated by ULA after 2006. Medium and heavy lift configurations are available, and crewed configurations were proposed at various times. The common booster uses a single RS-68 engine, and RL10 is used on the upper stage
Contains parts for Delta IV Medium, Medium+, and Heavy, including Common Booster Core, GEM-60 SRB, 4 and 5 meter variants of the Delta Cryogenic Second Stage, and fairings