U.S. Airmen with the 156th Security Operations Squadron, Puerto Rico Air National Guard, and the 123rd Contingency Response Group, Kentucky Air National Guard, patrol a trail during air base ground defense training at Muñiz Air National Guard Base in Carolina, Puerto Rico, Sept. 21, 2023. During the training, Airmen reinforced air base ground defense skills utilized during contingency response operations in contested environments by practicing radio communications, warning and operation orders, vehicle searches, vehicle take-downs, close-quarter battle, and small team tactics. (U.S. Air National Guard photo by Master Sgt. Rafael D. Rosa)