The highest rank in the Army, Air Force, and Marine Corps is General (four star), followed by Lieutenant General (three star), Major General (two star) and Brigadier General (one star). Five men have held the rank of General of the Army (five star), George C. Marshall, Douglas MacArthur, Dwight D. Eisenhower, Omar Bradley, and Henry H. Arnold, who later became the only five-star general in the USA Air Force. The five-star rank is no longer attainable.

Field marshal (or field-marshal, abbreviated as FM) is the second most senior military rank, ordinarily senior to the general officer ranks, but junior to the rank of Generalissimo. Usually, it is the highest rank in an army (in countries without the rank of Generalissimo), and as such, few persons are ever appointed to it. It is considered as a five-star rank (OF-10) in modern-day armed forces in many countries. Promotion to the rank of field marshal in many countries historically required extraordinary military achievement by a general (a wartime victory).