Randolph Abbott, 89, was writing a letter home while in a two-story building in Malmedy, Belgium, on Dec. 24, 1943, when he heard a German plane approaching.
Abbott's buddy was nearby, close to where Abbott's helmet was on the floor.
Both heard a bomb drop from the German plane.
The floor broke and Abbott fell through it, only to get tangled up in the debris.
His buddy was killed instantly.