The United States Army is the land warfare branch of the United States Armed Forces. Army Aviation also operates a significant number of helicopters. It was formed on June 14, 1775 and currently has an estimated 549,015 active personnel. The United States Army appears in Ace Combat: Assault Horizon as one of the playable factions.
In the Assault Horizon universe, the United States Army contributed personnel and equipment to the North Atlantic Treaty Organization Task Force 108, a multinational force intended to combat the potent SRN insurgency in East Africa. The main contributions were helicopter squadrons headed by Doug Robinson, which were responsible for engaging insurgent ground forces, conducting Search & Rescue, and supporting Special Operations missions.
During Andrei Markov's attack on Washington, D.C., United States Army Air Defense units partook in defense of the capital, despite suffering casualties when a Tu-160 Blackjack crashed into one of their batteries.
- AN/TWQ-1 Avenger (Jericho, seen in the mission "Akula", in the neighborhoods on the bank of the Potomac)
- MIM-104 Patriot (Jericho)