Master Sergeant Munguia was a member of the 17th Infantry Regiment, 7th Infantry Division. He was Killed in Action while fighting the enemy in North Korea on 26 November 1951. His remains were not recovered. His name is inscribed on the Courts of the Missing at the Honolulu Memorial.

Munguia 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.