First Lieutenant Gramberg was a member of Company E, 2nd Battalion, 27th Infantry Regiment, 25th Infantry Division. He was taken Prisoner of War while fighting the enemy in Korea on July 25, 1950, forced to march to North Korea on the "Tiger Death March", and died while a prisoner at Hanjang-ni, North Korea on February 28, 1951. His remains were not recovered. His name is inscribed on the Courts of the Missing at the Honolulu Memorial.