Alan Shepard served in the US Navy.
Alan Shepard . A graduate of the United States Naval Academy at Annapolis , Shepard saw action with the surface navy during World War II . He was Chief of the Astronaut Office from November 1963 to July 1969 ( the approximate period of his grounding ) , and from June 1971 until his retirement from the United States Navy and NASA on August 1 , 1974 .