Commerical Crew Program (CCP) Astronauts visit Aerojet Rocketdyn

NASA astronauts Eric Boe, from left, and Barry "Butch" Wilmore listen as an Aerojet Rocketdyne engineer discusses aspects of an RL10 engine during a tour of Aerojet Rocketdyne's facility in West Palm Beach, Florida. The engine will be one of two used for the Centaur upper stage during a United Launch Alliance Atlas V mission to launch Boeing's CST-100 Starliner on a flight test carrying a crew. The engine was test-fired as part of acceptance testing to confirm the engine is ready for flight.