Master Sergeant Grainger 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 11, 1950. He was presumed dead on December 31, 1953. His name is inscribed on the Courts of the Missing at the Honolulu Memorial. MSGT Grainger's remains have been recovered and identified.