Ballard enlisted in the United States Navy in 1965. After he completed navy recruit training and Hospital Corps School, he decided that he wanted to serve as a hospital corpsman with the United States Marine Corps and was sent to a Field Medical Service School. After he completed the course there, he was sent to Vietnam in 1967. Ballard was assigned as a navy corpsman with M Company, 3rd Battalion, 4th Marine Regiment, 3rd Marine Division in Quang Tri province, in South Vietnam.
