Lt. Gen. Fred McCorkle, U.S. Marine Corps, briefs reporters at the Pentagon on May 9, 2000, on the latest findings in the mishap investigation of the April 8, 2000, crash of one of the Marine Corps new MV-22 Osprey tilt-rotor aircraft. The crash, which killed all 19 Marines aboard, occurred at Marana Airport, just outside Tucson, Arizona. Capt. Aisha Bakkar-Poe (right), U.S. Marine Corps, points to the chart showing the speed, altitude, and orientation of the aircraft during the final six seconds of flight. McCorkle is the deputy chief of staff for aviation, Headquarters Marine Corps.