A 507th Security Forces Squadron defender guards the perimeter of a secure area during an exercise geared toward wartime preparation and readiness on the 507th Air Refueling Wing flightline March 2, 2019, at Tinker Air Force Base, Oklahoma. The 507th Air Refueling Wing's unit effectiveness inspection capstone event is scheduled for Nov. 15-19, 2019. (U.S. Air Force photo by Tech. Sgt. Lauren Gleason)