Lt. Col. Jonathan Bell, 11th Security Forces Squadron commander, presents a trophy to the squadron's winning team, Senior Airman Scott Gibson, center left, and Airman 1st Class Benjamin Gilmore, after completion of the 11th SFS Defender’s Challenge on Joint Base Andrews, Md., Oct. 3, 2018. The challenge tested defender’s physically and mentally in weapons knowledge, urban tactics, land navigation, self-aid buddy care and response to attack. (U.S. Air Force photo by Airman 1st Class Michael S. Murphy)