The Red Ensign was allocated to the Merchant Marine, the White Ensign became the flag of the Royal Navy, and the Blue Ensign was allocated to the naval reserve and naval auxiliary vessels.
(1892–1978) First staff corps officer to attain rank of admiral. All fleet command tours lasted one year except for the commander in chief of the U.S. Fleet, whose term was sometimes renewed for a second year, and the commander in chief of the Asiatic Fleet, whose command was considered a backwater. There was one admiral in the interim, however. Retired as rear admiral, 01 Jan 1937; advanced to admiral on the retired list, 14 Aug 1938; recalled as admiral, 13 Feb 1941; retired, 11 Feb 1942; recalled as admiral, 12 Apr 1944; retired, 31 Aug 1945. Notes include years of birth and death; awards of the. The Act of Congress of March 4, 1925, allowed officers in the Navy, Marine Corps, and Coast Guard to be promoted one grade upon retirement if they had been specially commended for performance of duty in actual combat.  He also felt there must be ranks above captain to avoid disputes among senior captains. The response to Congress stated: Should an officer of the Air Force or Navy be promoted to six-star rank, that officer should be entitled to the six-star insignia with a service specific crest..  Retired as rear admiral, Dec 1936; recalled as rear admiral, 13 May 1940; advanced to vice admiral on the retired list, 23 Feb 1942; advanced to admiral on the retired list, 16 Jun 1942; retired, Dec 1946.  Otherwise all flag officers must retire the month after their 64th birthday.  For the Army, Navy, and Air Force, no more than about 25% of the service's active-duty general or flag officers may have more than two stars, and statute sets the total number of four-star officers allowed in each service.  The standard tour length for most four-star positions is three years, bundled as a two-year term plus a one-year extension, with the following exceptions: Extensions of the standard tour length can be approved, within statutory limits, by their respective service secretaries, the secretary of defense, the President, and/or Congress but these are rare, as they block other officers from being promoted. In 1903, Dewey was promoted to the unique rank of The Admiral of the Navy, which during his lifetime was considered to be equivalent to an admiral of the fleet, but was later declared to be senior to the five-star grade of fleet admiral. (1883–1960) Father of Navy four-star admiral. Congress revived the rank in 1899 to honor George Dewey, stipulating that the grade would again cease to exist upon his death or retirement.
A Vice Admiral commands a regional Navy fleet during an operation or war and answers directly to the Fleet Admiral and the President of the United States. (1956– ) First Asian-American to achieve the rank of admiral. Naval Academy.  Fleet Admiral William F. Halsey got his fifth star in December 1945. Nimitz. An admiral is the top commissioned officer in the United States Navy, on par with a U.S. Army general, and is outranked only by a fleet admiral. 97 Sess.  However, exceptions to this limit are made to meet operational needs. 97 Sess.