US Air Force footage of the secret X-37B space plane landing at Vandenberg Air Force Base, Calif., on June 16, 2012 at 5:48 AM local time. The plane's mission has not been disclosed.
1956 – USAF Captain Milburn G. Apt becomes the first man to exceed Mach 3 while flying the Bell X-2. Shortly thereafter, the craft goes out of control and Captain Apt is killed. From a dive at high altitude, the aircraft ...