X-15 Move to Fourth Building
Retired NASA astronaut and the only surviving X-15 pilot, Maj. Gen. (Ret.) Joe Engle sat in the X-15 cockpit one more time. The X-15 became the first aircraft to be moved into the fourth building on Oct. 2, 2015, where it will be part of the expanded Space Gallery. (U.S. Air Force photo by Ken LaRock)