Anaconda surface-to-air missile

The  Anaconda Surface-to-Air Missile is a type of anti-aircraft ordnance used by the UNSC, possibly used by large vehicles (although this is only speculation).

These missiles 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. Though they might have been used against the Covenant Cruiser as a last ditch effort to save the MAC generators.

In Halo Wars, two Anaconda SAM launchers may be attached to a a standard UNSC prefabricated base turret to complement the M202 XP Machine Gun with antiair abilities. These are very successful at bringing down pesky Banshees and Vampires.