at Deversoir, Egypt; 45th Squadron at Castel Benito, Libya). During most of 1943, the Ninth Air Force was officially assigned to RAF Middle East Command of the Mediterranean Air Command. However, the Ninth's 12th and 340th Bombardment Groups were assigned to the Tactical Bomber Force, the 57th and 79th Fighter Groups were assigned to the Desert Air Force, and the 324th Fighter Group was surprisingly assigned to XII Air Support Command. The Tactical Bomber Force under Air Commodore Laurence Sinclair, the Desert Air Force under Air Vice Marshal Harry Broadhurst, and XII Air Support Command under Major General Edwin House were sub-commands of the Northwest African Tactical Air Force (NATAF) under Air Marshal Sir Arthur Coningham. NATAF was one of the three major sub-commands of the Northwest African Air Forces (NAAF) under Lieutenant General Carl Spaatz. NATAF, Northwest African Strategic Air Force (NASAF) and Northwest African Coastal Air Force (NACAF), formed the classic tri-force, the basis for the creation of NAAF in February 1943. Ninth Air Force groups attacked airfields and rail facilities in Sicily and took part in Operation Husky, carried paratroopers, and flew reinforcements to ground units on the island. The heavy bombardment groups (B-24s) of the Ninth also participated in the low-level assault of the oil refineries at Ploesti, Romania on 1 August 1943. On 22 August 1943 the following groups were transferred from the Ninth Air Force to the Twelfth Air Force: 12th Bombardment Group (Medium) at Gerbini, Sicily with B-25s 57th Fighter Group on Sicily with P-40s 79th Fighter Group on Sicily with P-40s 324th Fighter Group at El Haouaria, Tunisia with P-40s and 340th Bombardment Group (Medium) at Comiso, Sicily with B-25s The 316th Troop Carrier Group was operating under Northwest African Troop Carrier Command with C-47 Dakotas and CG4A Waco Gliders. Ninth Air Force 1943 to June 1944 Concurrently with the amalgamation of Ninth Air Force formations in the Mediterranean with Twelfth Air Force, plans were afoot in Britain to devolve Eighth Air Force's medium bomber force to a separate command. This command was offered to Brereton, who accepted "with utmost eagerness", and the force was constituted, also as Ninth Air Force, on 16 October 1943. During the winter of 1943–1944 Ninth Air Force expanded at an extraordinary rate, so that by the end of May, its complement ran to 45 flying groups operating some 5,000 aircraft. With the necessary ground support units,