Air Defense Artillery Branch

The Air Defense Artillery Branch is the air defense branch of the United States Army, specializing in the use of anti-aircraft weapons (such as surface-to-air missiles) to conduct anti-aircraft warfare operations. In the U.S. Army, these groups are composed of mainly air defense systems such as the Patriot Missile System, Terminal High Altitude Area Defense (THAAD), and the Avenger Air Defense System which fires the FIM-92 Stinger missile.

Source: Wikipedia — Air Defense Artillery Branch (CC BY-SA 4.0)