Two drogue parachutes yank a 20-ton U.S. Army M-551A1 Sheridan tank from the inside of a U.S. Air Force C-17 Globemaster III. Fifty-five tons of heavy cargo and 204 paratroopers were successfully air-dropped from six C-17's to demonstrate the utility of the U.S. Air Force's newest airlifter to meet the Army's brigade air-drop requirement