sentences:  The Puerto Rico Air National Guard is headquartered at San Juan, Puerto Rico, and commanded by Brigadier General Wayne A. Zimmet.Under the "Total Force" concept, Puerto Rico Air National Guard units are considered to be Air Reserve Components (ARC) of the United States Air Force (USAF).Puerto Rico ANG units are trained and equipped by the Air Force and are operationally gained by a Major Command of the USAF if federalized.