Combined Chiefs of Staff

The Combined Chiefs of Staff (CCS) was the supreme military staff for the western Allies during World War II. It emerged from the meetings of the Arcadia Conference in December 1941. The CCS was constituted from the British Chiefs of Staff Committee and the American Joint Chiefs of Staff that was created, in part to present a common front to the British Chiefs of Staff, in early 1942 holding its first formal meeting on 9 February to coordinate U.S. military operations between War and Navy Departments.

Formed in February 1942, with its first meeting 23 January 1942 in the Public Health Building at Nineteenth Street and Constitution Avenue in Washington, the CCS charter was approved by President Roosevelt 21 April 1942. The American members of the CCS were General George C. Marshall, the United States Army chief of staff, the Chief of Naval Operations, Admiral Harold R. Stark (replaced early in 1942 by Admiral Ernest J. King); and the Chief (later Commanding General) of the Army Air Forces, Lt. Gen. Henry H. Arnold. In July 1942 a fourth member was added, the President's personal Chief of Staff, Admiral William D. Leahy.

On the British side the Chiefs of Staff only normally attended during the heads of states' conferences. Instead the British Joint Staff Mission was permanently situated in Washington, D.C. to represent British interests. The British members were a representative of the Prime Minister, in his capacity as Minister of Defence, and the Chiefs of Staff Committee, which consisted of the First Sea Lord, the Chief of the Imperial General Staff, and the Chief of the Air Staff, or the Washington representative of each. The representative of the Prime Minister was Field Marshal Sir John Dill and after his death Field Marshal Sir Henry Maitland Wilson. The Washington representatives of the Chiefs of Staff Committee, who normally met with the United States members in place of their principals, were the senior officers from their respective services on the British Joint Staff Mission in Washington. In the course of the war, the First Sea Lord was represented by Admiral Sir Charles Little, Admiral Sir Andrew Cunningham, Admiral Sir Percy Noble, and Admiral Sir James Somerville; the Chief of the Imperial General Staff was represented by Lt. Gen. Sir Coville Wemyss and Lt. Gen. G. N. Macready; and the Chief of the Air Staff was represented by Air Marshal D. C. S. Evill, Air Marshal Sir William L. Welsh, and Air Marshal Douglas Colyer.

The Combined Chiefs of Staff organization included the Combined Secretariat and a number of committees.

In the Northern hemisphere spring of 1942, Britain and the United States agreed on a worldwide division of strategic responsibility. On 24 March 1942, the U.S. Joint Chiefs of Staff were designated as primarily responsible for the war in the Pacific, and the British Chiefs for the Middle East-Indian Ocean region, while the European-Mediterranean-Atlantic area would be a combined responsibility of both staffs. China was designated a separate theater commanded by its chief of state, Chiang Kai-shek, though within the United States' sphere of responsibility. Six days later the Joint Chiefs of Staff divided the Pacific theater into three areas: the Pacific Ocean Areas (POA), the South West Pacific Area (SWPA), and the Southeast Pacific Area. The Pacific Ocean Area command formally became operational on 8 May.

The CCS usually held its meetings in Washington, D.C.. The full CCS usually met only during the great wartime conferences on grand strategy, such as at Casablanca (see List of World War II conferences). The meetings of heads of government at those conferences were designed to reach formal agreement on issues thoroughly staffed by the CCS. At the Casablanca Conference in January 1943, General Frank Maxwell Andrews was appointed commander of all United States forces in the European Theater of Operations.

Although it was responsible to both the British and American governments, the CCS controlled forces from many different countries in all theaters, including the Pacific, India and North Africa. Representatives of allied nations were not members of the CCS but accepted procedure included consultation with "Military Representatives of Associated Powers" on strategic issues. Much cooperation continued between the British and American militaries after the war including the Combined Chiefs of Staff structure, and it was used again during the Berlin Blockade of 1948 even as negotiations began that resulted in the North Atlantic Treaty Organization.