Adolf Hitler's nephew, William Hitler, served in the US Navy during World War II.
William Patrick Hitler was born in Britain in the Toxteth Park district of Liverpool, the son of Adolf Hitler's half-brother Alois Hitler, Jr. and Irish-born Bridget Dowling. The couple met in Dublin when Alois was living there during 1909; in 1910, they married in Marylebone in London and relocated back north to Liverpool, where William Patrick was born in 1911.
William relocated to Germany but immigrated to the United States, where he served in the United States Navy in World War II. He eventually received American citizenship.