NASA has initialized plans via a letter contract with Northrop Grumman for 12 additional Solid Rocket Boosters, or SRBs ... Space Shuttle Program. Those ten casings previously supported STS ...

The announcement came via the agency’s website, noting that Eric Boe, a two-time Space Shuttle astronaut ... went on to fly Apollo 16, STS-4 (Columbia) and STS-51C (Discovery).