NASA will contract with Boeing for an interim cryogenic propulsion stage to power at least the first two flights of its planned heavy-lift Space Launch System (SLS), based on the company's Delta Cryogenic Second Stage used on the Delta IV. After reviewing other upper stages, the U.S. space agency picked the Delta unit because it meets most of the requirements for lofting Orion multi-purpose crew vehicles in 2017 and 2021 atop a NASA-developed SLS main stage with strap-on boosters.
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