served in the RC. Though typically, soldiers sign contracts specifying that all eight years be served in the RC, with the first six years in drilling status and the last two years in a non-drilling IRR status. Soldiers entering directly into the U.S. Army Reserve nevertheless encompasses a period of initial entry training (IET). The amount of time begins with approximately nine weeks of Basic Combat Training (BCT), but total IET time varies according to the enlistee's elected Military Occupational Specialty (MOS) which dictates Advanced Individual Training (AIT). All U.S. Army Reserve Soldiers are subject to mobilization throughout the term of their enlistment. Soldiers who, after completing the AC portion of their enlistment contract choose not to re-enlist on active duty, are automatically transferred to the RC to complete the remainder of their Statutory Obligation (eight-year service total) and may be served in a drilling Troop Program Unit (TPU), Individual Mobilization Augmentee (IMA), or Individual Ready Reserve (IRR) status. Non-commissioned officers of the rank of Staff Sergeant (E-6) and above will reenlist for an indefinite status after they have served for 12 years of service or more. The United States Army Reserve was composed of 188,703 soldiers as of late 2020. Importance to the Active Army A significant portion of many unit types and specializations exist in the Army Reserve. Some unique enabling units only exist in the Army Reserve. Current active reserve formations and units Headquarters commands Army Reserve Headquarters - Fort Bragg (formerly United States Army Reserve Command (USARC)) located at Fort Bragg, North Carolina Through USARC, the CAR commands all Army Reserve units. USARC is responsible for the staffing, training, management, and deployment of units to ensure readiness for Army missions. The Army Reserve consists of three main categories of units: operational and functional, support, and training. Due to Base Realignment and Closure Act, the headquarters of USAR moved to Fort Bragg. Army Reserve Staff - National Capital Region (NCR) (formerly Office of the Chief of Army Reserve (OCAR)) located at both Fort Belvoir, Virginia and The Pentagon OCAR provides the Chief of Army Reserve (CAR) with a staff of functional advisors who develop and execute Army Reserve plans, policies and programs, plus administer Army Reserve personnel, operations, and funding. The CAR is responsible for plans, policies and programs affecting all Army Reserve Soldiers, including those who report directly to the Army. OCAR is composed of specialized