space required for them did not appear worthwhile, and all were converted back to regular infantry divisions. Three light divisions were formed, in response to combat experience in 1942 and 1943. The 10th Light Division was formed as a light division specializing in mountain warfare, the 71st Light Division as one specializing in jungle warfare, and the 89th Light Division as a light truck division. Theater commanders were lukewarm about the concept. General MacArthur felt that they had insufficient firepower, and they performed unsatisfactorily in training maneuvers, so the 71st and 89th were converted to regular infantry divisions. Despite its jungle training, the 71st Infantry Division was rushed to Europe in response to the German Ardennes Offensive. The 10th remained a special mountain division and fought as such in Italy. Airborne Five airborne divisions (11th, 13th, 17th, 82nd and 101st) were formed, but as early as the Allied invasion of Sicily (Operation Husky) in July 1943 it was apparent that there would not be sufficient troop carrier aircraft to employ them in the manner for which they had been intended. The activation of the 15th Airborne Division in 1943 was canceled, but this did nothing to reduce the disproportionate ratio of airborne to infantry divisions, as all divisions scheduled for activation in late 1943 were eventually canceled. General McNair considered converting the airborne divisions in the United States to light divisions but following the failure of the light division concept, the decision was taken to ship them as airborne divisions, cognizant of the fact that they would operate as light infantry divisions. The European Theater of Operations (ETO) favored a larger airborne division than Army Ground Forces, developing a larger division with two parachute infantry regiments, a glider infantry regiment almost identical to a standard infantry regiment and more support units, a total of 12,979 men. Airborne divisions in ETO were reorganized on this establishment. The 11th Airborne Division in the South West Pacific Area (SWPA) remained on the old AGF establishment. With a strength of only 8,500 men, it had one parachute infantry regiment and two smaller glider infantry regiments. Anti-aircraft No arm was in such urgent demand in 1942 as anti-aircraft units, and these units were shipped at high priority as soon as, and sometimes even before, they were fully trained. Once the Allied Air Forces began to get the upper hand, demand tapered off and it became