Argent V missile
From Halopedia, the Halo wiki
Argent V missiles can be used to destroy both surface and airborne targets, though technically a strictly surface-to-air weapon, Argent V missile racks can be mounted to vehicles, thus allowing a greater range. Mendez had a rack of these missiles on his personal Warthog back when he was a Chief Petty Officer while training the SPARTAN-II's on Reach.
