Private First Class Gualtiere was a member of the 8668th Army Unit, Korean Military Assistance Group (KMAG). He was taken Prisoner of War while advising the South Koreans in South Korea on 1 January 1951 and died while a prisoner on 24 March 1951. His remains were not recovered. His name is inscribed on the Courts of the Missing at the Honolulu Memorial.

For his leadership and valor, Private First Class Gualtiere was awarded the Bronze Star Medal, the Purple Heart, the Combat Infantryman's Badge, the Prisoner of War Medal, 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.