Senior Airman Stefiana Barnes, 349th Security Forces Squadron, drives a Humvee during convoy training for Patriot Wyvern at Travis Air Force Base, Calif., on Feb. 11, 2017. Security Forces Citizen Airmen encountered simulated improvised explosive devices and malfunctions as they traveled to Conex Village training site. (U.S. Air Force photo by Senior Airman Sam Salopek)