Western Union Defence Organisation

[6] The overall command structure was patterned after the wartime Supreme Headquarters Allied Expeditionary Force, which included a joint planning staff.

Within this broad direction, its special tasks in Western Europe were those such as: WUCOS included observers from the United States and Canada.

[12][15] The committee consisted of Western Union Commanders-in-Chief for the three military branches (Land, Naval and Air), as well as the senior officer, designated Chairman.

[2] The top-level headquarters of UNILION, with the office of the C-in-C Committee Chairman, was housed in Château des Fougères in Fontainebleau's neighbouring commune of Avon.

[11][17] UNILION's three subordinate commands, one for each service, were housed in the Henri IV quarter at the Palace of Fontainebleau: Much ill-feeling was caused in the headquarters from disagreements between Chairman Montgomery and CinCLand de Lattre.

The high-level headquarters of Chairman Montgomery of the C-in-C Committee was situated in Château des Fougères ( 48°25′17″N 2°43′58″E  /  48.42139°N 2.73278°E  / 48.42139; 2.73278 , demolished in 1998) [ 11 ] in Fontainebleau's neighbouring commune Avon .
NCOs of the Corps of the Royal Military Police displaying the Western Union Standard on 1 October 1949, outside Château de Courances , which served as private residence for Chairman Montgomery . [ 12 ] [ 13 ] [ 14 ]
Chairman Bernard Montgomery of the C-in-C Committee wearing the WU shoulder badge when meeting Dutch Prince Bernhard aboard HNLMS Tromp in July 1949 during Exercise Verity .