The Delta IV Upper Stage (Delta IV second stage, or SLS second stage for Block I) is a family of cryogenic rocket stages used on the  Delta IV rockets, and on the Block I Space Launch System . The Delta IV upper stage is most likely meant to be used on the Delta IV and space launch system, though it has payload room similar to that of the Saturn V third stage, hence you can put landers and cargo on top and conceal it with the fairings easier.

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