Mario Puzo wasn't sure audiences would understand the title Apocalypse Now

In a newly discovered letter between Francis Ford Coppola and Mario Puzo, Puzo offers Coppola some title advice. In fairness, Coppola also didn't know the meaning of "apocalypse."

‘Balding, rawhide-lean, just under six feet tall’: the real life soldier behind Robert Duvall’s Apocalypse Now role

Air cavalry’ commander John B Stockton was the inspiration behind Duvall’s napalm-sniffing Lt Col Kilgore in Francis Ford Coppola’s Vietnam war epic