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He was an Army intelligence officer in the 60s.
The President is the Commander in Chief. Below the President is the Secretary of Defense. The highest ranking military officer is the Chairman of the Joint Chiefs of Staff, who reports to the Secretary of Defense. Below the Chairman are the Joint Chiefs of Staff, who supervise the various military commanders of each of their services.
The secretary of state.
Secretary of Defense is the title on the US cabinet officer who runs the US armed forces. "Defense Secretary" may be a short form of Secretary of Defense or maybe refer to a similar position in some country other than the US.
The Secretary of Defense
The Secretary of the Army is the cabinet officer charged with the statutory duties associated with the Army. Note that the Secretary of the Army does not direct its operations in battle or defense. The Army is operated by the Department of Defense, and the President is the Comander in Chief of all armed forces. A link to the Wikipedia article on the Secretary of the Army is provided. 29 Jan 2009 -- The above answer is incorrect. The Secretary of the Army is NOT a Cabinet officer. All the Armed Forces (Army, Marine Corps, Navy and Air Force) come under the Secretary of Defense.
The president of the US is the Commander in Chief. The Secretary of Defense is second in authority. Congress can vote to declare war, but the President and Secretary of Defense manage it.
In most countries the Secretary of War (or Minister for War or Defense Minister; there are several titles for the same job) is a civilian, elected official who takes responsibility for the country's military services and to some extent for Foreign Policy insofar as this has military implications.
Secretary of Homeland Security
The second in command of the US Army is the executive officer.
Militarily, the Commanding Officer of the Navy is the Chief of Naval Operations, a 4 star Admiral. He reports to the Secretary of the Navy, who is a DoD civilian; he in turn reports to the Secretary of Defense.
Secretary of state is the senior cabinet officer