The future of NASA’s human spaceflight program shares a building here with the presses where the U.S. government prints passports: 16 large rocket engines bagged for protection from dust and dirt in an air conditioned warehouse. Fourteen of the reusable RS-25 Space Shuttle Main Engines stored in the Aerojet Rocketdyne (AJR) engine assembly area have flown in space before, and all of them will fly once more on the core stage of NASA’s heavy-lift Space Launch System (SLS). A 17th ...

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