George Dewey military branch United States Navy
George Dewey (December 26, 1837 – January 16, 1917) was Admiral of the Navy, the only person in United States history to have attained that rank. He is best known for his victory at the Battle of Manila Bay during the Spanish–American War, with the loss of only a single crewman on the American side.
Dewey was born in Montpelier, Vermont. At age 15, Dewey's father enrolled him at Norwich University in Northfield, Vermont. Two years later Norwich expelled him for drunkenness and herding sheep into the barracks. Summarily, he entered the United States Naval Academy in 1854. He graduated from the academy in 1858 and was assigned as the executive lieutenant of the USS Mississippi at the beginning of the Civil War. He participated in the capture of New Orleans and the Siege of Port Hudson, helping the Union take control of the Mississippi River. By the end of the war, Dewey reached the rank of lieutenant commander.
After the Civil War, Dewey undertook a variety of assignments, serving on multiple ships (including the USS Constitution) and as an instructor at the Naval Academy. He also served on the United States Lighthouse Board and the Board of Inspection and Survey. He was promoted to commodore in 1896 and assigned to the Asiatic Squadron the following year. After that appointment, he began preparations for a potential war with Spain, which broke out in April 1898. Immediately after the beginning of the war, Dewey led an attack on Manila Bay, sinking the entire Spanish Pacific fleet while suffering only minor casualties. After the battle, his fleet assisted in the capture of Manila. Dewey's victory at Manila Bay was widely lauded in the United States, and he was promoted to Admiral of the Navy in 1903.
Dewey explored a run for the 1900 Democratic presidential nomination, but he withdrew from the race and endorsed President William McKinley. He served on the General Board of the United States Navy, an important policy-making body, from 1900 until his death in 1917.Midshipman
As a midshipman, Dewey first went to sea on a practice cruise aboard USS Saratoga; on this cruise he earned recognition as a cadet officer. As a result, he was assigned to one of the best ships of the old Navy—the steam frigate USS Wabash. Wabash under Captain Samuel Barron was the new flagship of the Mediterranean Squadron. On 22 July 1858, the ship left Hampton Roads for Europe.Wabash reached her first port of call, Gibraltar, on 17 August 1858. She cruised in the Mediterranean, and the cadet officers visited the cities of the Old World accessible to them, often taking trips inland. Dewey was assigned to keep the ship's log. Wabash returned to the New York Navy Yard on 16 December 1859, and decommissioned there on 20 December 1859. Dewey served on two short-term cruises in 1860.Dates of rank
Acting Midshipman, United States Naval Academy: September 23, 1854
Warranted Midshipman: June 11, 1858In the mid to late-18th Century, the US Navy had three "ranks" of Midshipmen serving:  "acting midshipmen" who were active students at the US Naval Academy, "warranted midshipmen" who had completed most of their studies at the Academy and were serving at sea while holding line authority through a warrant of authority, and "passed midshipmen" who had completed all requirements for commissioning and held warranted line authority similar to ensigns of the modern US Navy.  In the era of the Civil War, it was a common practice for officers to serve as a "Master" with a warrant of authority until they were commissioned. It was also common for officers to be granted shipboard commissions based on the need to fill certain jobs or billets. Dewey was therefore made a lieutenant once he "signed on" with David Farragut. He never held the ranks of ensign or lieutenant (junior grade) as those ranks were not created until 1862 and 1883, respectively.  Nor was he appointed to the rank of vice admiral, there being no actively serving vice admirals in the US Navy at that time.Admiral Dewey's final rank was Admiral of the Navy, making him the highest-ranking officer in the history of the United States Navy. He is the only person ever to hold this rank. Admiral of the Navy is equivalent to General of the Armies. General John J. Pershing, US Army, was promoted to General of the Armies in 1919, Lieutenant General George Washington, US Army, was posthumously promoted on the Retired List of the US Army to the rank of General of the Armies of the United States, with an effective date of rank of 4 July 1776, and General Ulysses S. Grant also received a posthumous promotion on December 27, 2022.Admiral Dewey served a total of 62 years on active duty in the U.S. Navy.  This was just one year less than Admiral Hyman G. Rickover.
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