Private First Class Caillouet was a member of Battery D, 2nd Battalion, 11th Marines, 1st Marine Division. He was Killed in Action while fighting the enemy in Korea on 7 December 1950.

Caillouet was awarded the Purple Heart, the Combat Action Ribbon, 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.