John Lincoln Clem, famously known as Johnny Shiloh, was a United States Army general who served as a drummer boy in the Union Army in the American Civil War. He gained fame for his bravery on the battlefield, becoming the youngest noncommissioned officer in Army history. He retired from the U.S. Army in 1915, having attained the rank of brigadier general in the Quartermaster Corps; he was at that time the last veteran of the American Civil War still on duty in the U.S. Armed Forces, although others similarly aged and experienced such as Peter C. Hains and Albert A. Michelson rejoined the military after World War I started. By special act of Congress on August 29, 1916, he was promoted to major general one year after his retirement.