Use of titanium armor on combat vehicles is increasing. The use of titanium can lighten the vehicle's weight. Appliqué armor can be quickly applied to vehicles and has been utilized on the U.S. Army's M8 Armored Gun System. Fire suppression Contemporary combat vehicles may incorporate a fire-suppression system to mitigate damage from fire. Systems can be employed in the engine and crew compartments and portable systems may be mounted inside and outside the vehicle as well.