Air Force Col. Robert Behnken, an astronaut from Air Force Space Command, pilots the Boeing Starliner simulator at the 33rd Space Symposium in Colorado Springs, Colo., April 6, 2017. Col. Behnken has flown on two space shuttle missions with the National Aeronautics and Space Administration, and is currently training to fly the Starliner, which is designed to send astronauts to the International Space Station.

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