Technicians at Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at NASA’s Kennedy Space Center in Florida mate the two domes that comprise the main pressure vessel of Boeing’s Orbital Flight Test CST-100 Starliner. This is one of the last major assembly milestones before final outfitting and closeouts as Starliner prepares for its first mission, the uncrewed test flight later this summer. Boeing’s uncrewed Orbital Flight Test is part of NASA’s Commercial Crew Program, which is working with Boeing to return human spaceflight launches to the space station from U.S. soil.