Compared to the Challenger 1 MBT that saw service during the Gulf War, the Challenger 2 features improved second generation Chobham armor capable of withstanding armor piercing and shape charge rounds. The fire control system was updated with the latest digital technology, including a panoramic Commander's sight with built-in laser rangefinder and a thermal gunner's sight. The 120mm L30 rifled main gun provides improved muzzle velocity and accuracy, and enables the Challenger 2 to discharge armor piercing, HESH, smoke and depleted uranium rounds. Special modifications to tanks deployed to Iraq included reactive armor added to the front, composite armor on the sides, a special cover to reduce exhaust heat, canvas skirts to reduce dust ingestion, Commander's Independent Thermal Viewer (CITV) and Combat Identification Panels (CIP).