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No, See Sousa's book "Marching Along" for more information about Sousa in the Navy.
John Philip Sousa was responsible for being a conductor during his time in the military. John was also a Warrant Officer and part of both the Marines and the Navy.
John Philip Sousa was born in Washington, D.C.; however, his father, John Antonio Sousa, was born in Spain to Portuguese parents (they had fled to Spain from Portugal during the Peninsular War), and his mother, Marie Elisabeth Trinkaus, was from Bavaria, Germany. Mother and father met in New York while John Antonio was enlisted in the US Navy (stationed at the Brooklyn Navy Yard) and Marie Elisabeth was staying in Brooklyn with some relatives. They later moved to DC when John Antonio joined the US Marine Band as a trombonist. So, Sousa is a Portuguese name (pronounced soo-sa, not soo-za) and John Philip is half of Portuguese ancestry.
John Philip Sousa was a band major in the Marines. His official title while he was in the miltary was a Warrant Officer. He held the command of U.S. Marine Band, U.S. Navy Great Lakes Naval Station Band.
He invented the submarine, something like an underwater boat, if you don't know what it is. John Philip Holland developed the first submarine to be formally commissioned by the U.S. Navy, and the first Royal Navy submarine, the Holland.
John Shaw - navy - died in 1823.
John Shaw - navy - was born in 1773.
His current Rank is Admiral of the Fleet
John Henslow - Surveyor of the Navy - was born in 1730.
John Henslow - Surveyor of the Navy - died in 1815.
John Bradley - Navy - died on 1994-01-11.
John McGovern was the Secretary of the Navy in the 1980s but he was not an admiral