Lockheed C-5 Galaxy airplane model. The Lockheed C-5 Galaxy is one of the world's largest aircraft. It is almost as long as a football field and as high as a six-story building and has a cargo compartment about the size of an eight-lane bowling alley. The C-5 is the only aircraft that can transport any of the Army's combat equipment, including the 74-ton (66,600-kilogram) mobile scissors bridge, tanks and helicopters. The maximum weight for takeoff during peacetime is 769,000 pounds, and the allowance increases to 840,000 pounds in wartime. However, the plane has been flight tested at more than one million pounds at the Air Force Test Center at Edwards, AFB.