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One of the signs which accompany the Starliner pressure vessel. It reads

Boeing CST-100
Starliner Pressure Vessel

Get up-close to the pressure vessel of the Boeing Starliner capsule, the primary structure that will protect astronauts and cargo during launch to the International Space Station (ISS) as part of NASA's Commercial Crew Program.

The Starliner pressure vessel is the skeleton of the crew module, and it resides inside the spacecraft's out aerodynamic design. Constructed from an aluminum alloy material without welds, Starliner is designed for up to 10 trips between Earth and the ISS.