30 August 1780 – General Benedict Arnold betrayed the US when he promised secretly to surrender the fort at West Point to the British army. Arnold whose name has become synonymous with traitor fled to England after the botched conspiracy. His co-conspirator, British spy Major John Andre, was hanged. 1945 – A proclamation to the German people is signed today formally announcing the establishment of the Allied Control Council and its assumption of supreme authority in Germany. 1952 - As a pair of Northrop F-89 Scorpions of the 27th Fighter-Interceptor Squadron, Griffiss AFB, New York, perform a flypast, Northrop F-89C-30-NO, 51-5781, disintegrates in flight during a display at the International Aviation Exposition at Detroit-Wayne Major Airport, Detroit, Michigan, killing the Scorpion pilot, Maj. Donald E. Adams, a Korean war jet ace (6.5 kills), radar operator Capt. Kelly, and one spectator. Cause was found to be from severe torsional aeroelastic problems that led to all F-89Cs being grounded and returned to the factory for wing structural redesign. 1955 – A Vought F7U-3 Cutlass, BuNo 129592, of VF-124, misses all the wires during a landing aboard USS Hancock (CVA-19), operating off of Hawaii, and hits the barrier. "Although reported to have suffered only slight damage, it was struck off charge and never flew again." 1966 – Test pilot Pete Knight flew the X-15 to 30,541 meters (100,200 feet) and Mach 5.21. 1984 - A United States Navy North American T-2C Buckeye crashes into the Chesapeake Bay shortly after take-off from NAS Patuxent River, Maryland, killing the student and seriously injuring the instructor.