United States Army air defense relies on a range of ground launched missiles ranging from hand held to vehicle mounted systems. The Air Defense Artillery is the branch that specializes in anti-aircraft weapons (such as surface-to-air missiles). In the US Army, these groups are composed of mainly air defense systems such as the PATRIOT Missile System, Terminal High Altitude Air Defense, and the Avenger Air Defense system which fires the FIM-92 Stinger missile.