Senior Airman Casey Walker, a 146th Air Support Operations Squadron tactical air control party Airman, fires as he engages a target during a rescue scenario for isolated personnel who are injured during exercise Sentry Rescue III, Aug. 25, 2020, at Fort Sill, Okla. Sentry Rescue III integrates Combat Air Force and Air Force Special Operations entities to develop tactics, techniques and procedures for personnel recovery scenarios. (U.S. Air National Guard photo by Staff Sgt. Brigette Waltermire)