Anaconda surface-to-air missile
From Halopedia, the Halo wiki
The Anaconda Surface to Air Missile is a type of anti aircraft ordinance used by the UNSC.
These missles are only mentioned once in the Halo series, during the book Halo: First Strike where the SPARTANS of Red Team recover a crate marked HIGHCOM Armory Omega during the Battle of Reach that contained six Anaconda Surface to Air Missiles and a pair of Fury Tactical Nukes; as far as we know the missiles were never used according to the book.
