NASA Administrator Jim Bridenstine, center, meets with Expedition 54 NASA astronauts Mark Vande Hei, left, and Joe Acaba during their Expedition 54 post flight, Wednesday, June 13, 2018 at NASA Headquarters, Washington.
NASA Administrator Jim Bridenstine, center, meets with Expedition 54 NASA astronauts Mark Vande Hei, left, and Joe Acaba during their Expedition 54 post flight, Wednesday, June 13, 2018 at NASA Headquarters, Washington.
Photo Credit: NASA/Bill Ingalls