United States Army Europe (USAREUR) is an Army Service Component Command of the United States Army. It is responsible for directing US Army operations throughout the United States European Command Area of Responsibility. During the Cold War, HQ USAREUR supervised ground formations primarily focused upon the Warsaw Pact militaries to the east as part of the North Atlantic Treaty Organisation's (NATO) Central Army Group. Since the Revolutions of 1989, USAREUR has greatly reduced its size, dispatched US forces to Operation Desert Shield and Desert Storm, and increased security cooperation with other NATO land forces.