In 1942 President Franklin D. Roosevelt set up a new command structure to provide leadership in the US Armed Forces while retaining authority as Commander-in-Chief as assisted by Secretary of War Henry Stimson with Admiral Ernest J. King as Chief of Naval Operations in complete control of the Navy and on the Marine Corps through its Commandant, then Lt. General Thomas Holcomb and his successor as Commandant of the Marine Corps, Lt. General Alexander Vandegrift, General George C. Marshall in charge of the Army, and in nominal control of the Air Force, which in practice was commanded by General Hap Arnold on Marshall's behalf. King was also in control for wartime being of the US Coast Guard under its Commandant, Admiral Russell R. Waesche. Roosevelt formed a new body, the Joint Chiefs of Staff, which made the final decisions on American military strategy and as the chief policy-making body for the armed forces.