First Lieutenant Haag was a member of Company K, 3rd Battalion, 21st Infantry Regiment, 24th Infantry Division. He was listed as Missing in Action while fighting the enemy near Chochiwon, South Korea on July 12, 1950. He was presumed dead on March 8, 1954. His name is permanently inscribed on the Courts of the Missing at the Honolulu Memorial. 1LT Haag's remains have been recovered and identified.