James Mahoney graduated from the U.S. Naval Academy at Annapolis, Class of 1881. In 1904 he commanded the Marine battalion that performed drills and other services at the Louisiana Purchase Exposition in St. Louis, Missouri, and was subsequently received a Letter of Commendation from the Department of the Navy for his work. He subsequently served in Panama, Vera Cruz, Mexico, an in Cuba. After promotion to temporary rank of Brigadier General, he retired as a Colonel of Marines in 1919.



