Argent V missile
From Halopedia, the Halo wiki
Argent V missiles, also designated M4510 ASGM-2, are 65mm missiles capable of destroying both surface targets and aircraft. These missiles are usually mounted on the M12R Rocket Warthog, the M9 Main Anti-Aircraft Tank, and the AC-220 Gunship.
Franklin Mendez was known to mount a rack of these missiles on his personal Warthog, back when he was training the SPARTAN-II's on Reach as a Chief Petty Officer. Ilsa Zane was also known to operate a similarly-modified vehicle.
Argent is a French word meaning "silver".
List of appearances