Private First Class St. Onge was a member of the 38th Infantry Regiment, 2nd Infantry Division. He was seriously wounded by the enemy in South Korea on 15 March 1951 and died of those wounds the following day.

PFC St. Onge was awarded the Purple Heart, the Combat Infantryman's Badge, the Korean Service Medal, the United Nations Service Medal, the National Defense Service Medal, the Korean Presidential Unit Citation and the Republic of Korea War Service Medal.