M2950 Harpoon nuclear missile
From Halopedia, the Halo wiki
Template:Not Canon Template:Weapon The Harpoon nuclear missile is a United Nations Space Command starship-mounted thermonuclear weapon. It is mentioned in a peice of concept art for the UNSC corvette Andraste that Isaac Hannaford designed for Halo 3, though it was not featured in the game.[1]
Trivia
It shares its name with a modern-day anti-ship missile.
Sources