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NASA pilots enter new frontier
Christina Koch, NASA astronaut (left), and Lt. Col. Nicole Mann, United States Marine Corps, NASA astronaut, receive academic instruction on how their bodies will react to piloting aircraft at higher altitudes July 7, 2016, at Beale Air Force Base, California. Koch and Mann, graduated from astronaut candidate training in July 2015, and are now enrolled in Space Flight Readiness Training. (U.S. Air Force photo/ Senior Airman Bobby Cummings)