Guinea, later in the China-Burma-India area of operations, to eject cargo bundles they have previously prepared for airdrop from the doors over drop zones. By 1944 the IX Troop Carrier Command in Europe included personnel designated as "dropmasters" in its troop carrier squadrons. Also in 1944 the Air Transport Command began assigning enlisted men, most of whom had been in training for aircrew duty in other fields, including pilots, navigators and bombardiers, as "flight clerks." The first flight clerks were assigned to special flights known as "Red Ball" which were set up to deliver crucial aircraft parts to ATC units in India assigned to the India-China Ferry. By the end of the war, flight clerks were flying on most four-engine transports to be responsible for cargo manifests and take care of passengers. Weight and balance computation does not appear to have initially been one of their duties, although it has been associated with the loadmaster career field since it was established. They were given the MOS 2967 - Flight Traffic Clerk. The new MOS was obviously an outgrowth of the 967 MOS, which had been given to men assigned to air cargo units as air traffic specialists. During World War II, aircraft were initially loaded haphazardly, with ground personnel piling as much cargo into an airplane as possible, which often led to weight and balance problems. To alleviate the situation, air terminal squadrons were set up by the troop carrier wings overseas and, after the establishment of the Air Transport Command, at air terminals in the United States. Officers, pilots and navigators, were trained to perform weight and balance calculations and became responsible for load planning. Aerial engineers on bombers and four-engine transports were also trained in weight and balance calculations using special slide rules developed for each airplane and commonly known as "slipsticks". Late 1940s, Korean War, and the 1950s The term "loadmaster" is believed to have been created by the Douglas Aircraft Company, because the first known use of the term appears in the flight manuals for the C-124 Globemaster II aircraft in the late 1940s, the largest piston-engine transport aircraft in the US inventory at the time. A fixed-wing aircraft is supported in flight only by its wing(s). For an aircraft to become and remain airborne, the wing must move through the air at a specified "angle of attack". To assure that the wing moves through the