The Challenger demonstrated and proved its combat worth during the recent Gulf Conflict. In addition to painting the tank with an overall sand color, many modifications for desert operations were accomplished, including an improved cooling system; better air cleaners; a reinforced transmission; extra side skirts from Chobham armor for added protection, plus bolt-on Reactive armor applied to the frontal area; an additional 200 liters of fuel was carried in external tanks mounted on the rear of the tan, which greatly extended its range; extra external stowage bins; and the use of maintenance free batteries.