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PROMONTORY, Utah -- Orbital ATK provided SpaceFlight Insider with an exclusive review of the solid rocket boosters that will be used on the first flight of NASA's Space Launch System (SLS) rocket - Exploration Mission 1 (EM-1). That flight is currently scheduled to take place in 2019 and will see one of the space agency's crew-rated Orion spacecraft travel to lunar orbit on a planned three-week long mission. Photos courtesy: Jason Rhian