Fatty (1922-1944), as he is known by, is a deceased member of Cotton Hill's squad from his days in World War II.
In Service with Cotton
After the military transport ship they were on was torpedoed by an Imperial Japanese submarine, Cotton could only afford to save three of his companions: Fatty, Stinky, and Brooklyn. A Japanese Zero fighter plane saw the four floating in the ocean, and opened fire. The blood from the bullet wounds Cotton sustained attracted sharks, so, in the end, Fatty was sacrificed to save the others. Then later after Cotton got his shins blown off by "a Japanese man's machine gun", Cotton allegedly used Fatty's severed foot to beat all the Japanese soldiers to death.