The Western Air Defense Sector’s 225th Support Squadron conducts a joint technical inspection of the radar and radios at Ajo Defense Program Facility near the U.S./Mexico border in Arizona, Jan. 23, 2024. Ajo is equipped with an Air Route Surveillance Radar Model 4 (ARSR-4) which is a three-dimensional, long-range radar, and high-frequency radios. The system is jointly used by the Federal Aviation Administration (FAA) and the U.S. Air Force to control airspace within the continental United States. (U.S. Air National Guard photo by Bruce Robie)