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General of the Army (GA)[1] is a five-star general officer and is the second highest possible rank in the United States Army. A special rank of General of the Armies, which ranks above General of the Army, does exist but has only been conferred twice in the history of the Army. A General of the Army ranks immediately above a general and is equivalent to a fleet admiral and a General of the Air Force. There is no established equivalent five-star rank in the other Federal uniformed services (Marine Corps, Coast Guard, PHSCC, and NOAA Corps). Often referred to as a "five-star general," the rank of General of the Army has historically been reserved for wartime use and is not currently active in the U.S. military.   from www.wikipedia.com