U.S. Air Force Staff Sgt. Emily Arceneaux, 81st Security Forces Squadron police services NCO in charge, aims her weapon towards the room where the "shooter" has barricaded himself during an 81st SFS active shooter training demonstration at Keesler Air Force Base, Mississippi, March 14, 2019. The scenario included a disgruntled Airman with marital problems and a pending administrative discharge who ran the entry gate which then escalated to an active shooter situation. Leadership attended the event, which is one of several in recognition of the Year Of The Defender, to observe what steps Keesler Defenders take during a high intensity situation, such as an active shooter, in preparation for real-world situations. (U.S. Air Force photo by Kemberly Groue)