A medium-lift American launch vehicle developed to carry Cygnus cargo spacecraft to the International Space Station under NASA's Commercial Resupply Services program. Its early variants used refurbished Soviet-era NK-33 engines before switching to Russian RD-181 engines, a dependency later broken by a redesign built with Firefly Aerospace after 2022.
Facts
Vehicle ClassMedium-lift expendable cargo launch vehicle 1 Manufacturer First Flight Date StatusOperational, launching Cygnus resupply missions to the International Space Station. 1 Cross-Tradition Connections
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