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Due to the retirement of the Antares 230+ rocket, Northrop Grumman purchased three missions from SpaceX to launch the Cygnus spacecraft to the International Space Station before the Antares 330 rocket enters operation and fulfill the CRS Phase 2 contract manifest.
Cygnus NG-21 (Northrop Grumman-21) is a cargo resupply mission of the Northrop Grumman Cygnus spacecraft to the International Space
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