NASA astronaut Nicole Mann, assigned to fly in the Crew Flight Test of Boeing’s CST-100 Starliner, practices opening a mockup of the spacecraft hatch on the International Space Station’s International Docking Adapter at NASA’s Johnson Space Center in Houston, Texas. Boeing’s Crew 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.