He attended the University of Oregon and then transferred to the United States Military Academy at West Point, from which he graduated in 1918 with a commission as a second lieutenant of artillery.

[1][2][3] Having graduated in November during a wartime expansion of the West Point student body, Montague began his career too late for active combat in World War I.

[10][11] From 1945 to 1947 Montague served as deputy commander of the Army's Air Defense Artillery Center at Fort Bliss, Texas.

He did not recover, and died on February 20 from a cerebral hemorrhage at Gorgas Hospital, Balboa, Panama Canal Zone.

After retiring from the Army the younger Montague served as executive director of the Joseph P. Kennedy Jr. Foundation and the Special Olympics.