One of twelve children of a 27th District patrolman in Philadelphia, Pennsylvania, Aloysius McGonigal knew even before beginning education at a Catholic elementary school that he wanted to become a priest. He attended Saint Joe’s Preparatory School, running track and swimming on the competitive teams, and graduated in 1936. He then entered the Saint Isaac Jogues Jesuit Novitiate at Wernersville, Pennsylvania, along with one of his brothers. He left school in World War II and enlisted in the Coast Guard. He was ordained a Catholic Priest in 1953 at Woodstock College near Baltimore, and in 1961 joined the U.S. Army as a chaplain, serving in Korea, returning home in 1963 after the death of his brother. In 1966 he was working on a doctorate in physics from Georgetown when he was slated for a mission to India. Instead, he joined the Army, and was deployed in 1966 to Vietnam, where he served two tours and was killed in action. Despite being an Army chaplain, his service to Marines was honored by the Marine Corps naming a chapel in his honor at Camp Pendleton.