Grampa is a veteran of World War II, where he served as Master Sergeant of the Flying Hellfish unit. At the very end of war in Europe, Grampa's unit "liberated" a stash of priceless art from surrendering German forces. The Flying Hellfish formed a tontine, and buried the art in a trunk at sea. Decades later, Montgomery Burns, the second surviving member of the unit, tried to murder Grampa in order to get the art, prompting Grampa to violate the tontine. When Grampa and Bart retrieved the art from Mr. Burns, the State Department arrived to return the art to its rightful owner. Grampa was a hated wrestler named "Glamorous Godfrey" in the 1950s, revealed in the episode "Gorgeous Grampa", starring him and Mr. Burns.