To foster cooperation between the British RAF and the American USAAF in particular, the commands listed above and their various sub-commands were intended to have a commanding officer from one air force and a deputy from the other air force. In keeping with this plan, Spaatz's deputy of NAAF was Air Vice-Marshal
James Robb who handled operations. In particular, the flexibility between Coningham's WDAF and the
8th Army has been contrasted with the more rigid relationship between the Luftwaffe and German ground forces. The United States
12th Air Force, the largest air force ever assembled soon after its inception several months earlier, ceased to exist in the new MAC organizational structure. The 12th simply disappeared as its groups were distributed among the various new NAAF commands above. The sole reference to the 12th Air Force among the higher tier commands was Brigadier General Edwin House's XII Air Support Command which along with Air Vice Marshal
Harry Broadhurst's Western Desert Air Force, Air Commodore
Laurence Sinclair's Tactical Bomber Force, and Air Commodore Sir
Kenneth Cross'
No. 242 Group, became subordinate commands of Coningham's NATAF. Later, XII Air Support Command became even less obvious in the MAC structure when it was detached to No. 242 Group. Prior to the invasion of Sicily (
Operation Husky) in July 1943, No. 242 Group was assigned to Lloyd's NACAF on Malta. NAAF was the first official command based upon the "tri-force" model. Successfully practiced and developed during the
Tunisian,
Pantellerian,
Sicilian, and
Italian campaigns, the tripartite model was retained by subsequent Allied air forces for
D-Day Normandy and
D-Day Southern France. Even some of today's air forces consider the historical precedents of the "tri-force" model. ==Termination & reorganization of NAAF==