The first U.S. astronauts who will fly on American-made, commercial spacecraft to and from the International Space Station, wave after being announced, Friday, Aug. 3, 2018 at NASA's Johnson Space Center in Houston, Texas. Astronauts Bob Behnken, left, Victor Glover, Doug Hurley, and Mike Hopkins will fly SpaceX's Crew Dragon flights, and astronauts Eric Boe, Suni Williams, Chris Ferguson, Josh Cassada, and Nicole Aunapu Mann, right, will fly on Boeing's CST-100 Starliner. Photo Credit: (NASA/Bill Ingalls)