Submitting a long-range plan for the Reserve Forces of the United States Air Force on 27 July. General Smith asserted that its adoption would provide a balanced reserve force by 1958. The plan provided for 27 Air National Guard and 24 Air Force Reserve tactical wings, 6 Air Force Reserve flying training wings, and almost 1,300 Air Force Reserve nonflying units. This structure would accommodate 250,000 members and provide flying and combat crew training for 38,000 in wing and squadron aircraft. The plan was approved on 9 August. However, due to the recalls caused by Korea, the Air Force Reserve had no aircraft, and none would be available until July 1952. Upon mobilization in 1950 and 1951, Air Force Reserve units remaining intact had kept their aircraft, while aircraft belonging to the mobilized "filler" units had been redistributed. With the post-Korean War expansion of the Air Force, on 24 November 1954, the Joint Mid-Range War Plan identified a D-Day requirement for fifty-one Air Reserve Forces wings. This was approved on 4 January 1955 by General Nathan Farragut Twining, USAF Chief of Staff. The contemporary Air Force Reserve of today began with General Twining's resultant statement:  The new mobilization requirement was for twenty-seven Air National Guard and twenty-four Air Force Reserve tactical wings. The latter included nine fighter-bomber, two tactical bombardment, and thirteen troop carrier units. In addition to providing units to augment the active force for limited or full-scale war, by mid- 1955 the Air Force Reserve had a requirement to provide the Air Force with trained individuals in wartime to augment and replace the attrition in the active force. These personnel were to be recruited, matched against specific wartime requirements, and trained in specific skills. Thus provided with an adequate framework of national policy and Department of Defense guidance, ConAC and the major air commands which would gain the Air Reserve Forces units and individuals upon mobilization began to develop the force into a combat-ready mobilization asset. For the first time, the Air Force Reserve possessed no trainer aircraft, and the units did all their flying in tactical aircraft: B-26 Invader, F-80 Shooting Star, F-84 Thunderjet, C-46 Commando, and C-119 Flying Boxcar. Fighter-Bomber Wings were aligned to Air Defense Command. Tactical Bombardment and Troop Carrier Wings were aligned to Tactical Air Command. Beginning in 1956 the Air Force Reserve flying unit program expanded to include air rescue squadrons equipped with the fixed-wing amphibious Grumman HU-16 Albatross aircraft.