The Fourteenth United States Army, often abbreviated as the 14th USAR, is a component of the U.S. Army Reserve and National Guard. Its primary function is to provide tactical, operational, and strategic forces in support of civil authorities during domestic emergencies or under the Unified Command structure in a theater of operations. This army division is part of the larger United States Army organization, which serves as a major branch of the U.S. Armed Forces. The 14th USAR operates under the command of the Commander-in-Chief, United States Army Reserve and is headquartered at Fort Knox, Kentucky.