Southeast of Mojave, Edwards Air Force Base is a flight test facility for the US Air Force, NASA and civilian aircraft, and a training school for test pilots with the 'right stuff.' It was here that Chuck Yeager flew the world's first supersonic flight; the first space shuttles glided in after their missions; and in 2004, SpaceShipOne became the first civilian aircraft to reach suborbital altitudes - twice. At press time, the base was open to visitors on a limited basis.