“Retrofit 1b” starts in August Aerojet Rocketdyne was awarded a contract by NASA in late 2015 to restart production of the RS-25, formerly known as the Space Shuttle Main Engine (SSME ...

SLS’s initial operating capability uses leftover Space Shuttle Main Engine (SSME) hardware as the engines for the Core Stage of the vehicle. The Boeing-built Core is a ground-started sustainer ...