Col. Kristian Post (center), 193rd Special Operations Group conversion officer, makes his way under a water-logged parachute during the 193rd SOG's Survival, Evasion, Resistance and Escape water survival training held at Mount Gretna Lake, Mount Gretna, Pennsylvania, Aug. 12, 2017. Operations group Airmen are required to complete this training once every three years. The objective of the training is to ensure they have the knowledge and confidence to survive an aircraft mishap over water. (U.S. Air National Guard photo by Tech. Sgt. Claire Behney/Released)