Chad Martin, a Keesler firefighter, cools off by pouring a bottle of water on his face during an exercise July 18, 2012, at Keesler Air Force Base, Miss. Keesler held the three-day exercise to test the response of base personnel. In the exercise scenario, a disgruntled base employee sprayed harmful chemicals on airmen in the Triangle training area injuring several people. Witnesses contacted 911 and within minutes, members of the 81st Security Forces Squadron apprehended the individual and first responders began decontamination and treatment of the victims. (U.S. Air Force photo by Kemberly Groue/Released)