Tech. Sgt. Zach Angel, a SERE specialist with the 910th Operations Support Squadron, instructs Reserve Citizen Airmen on how to escape their parachutes during water survival training at Hubbard Community Pool, September 9, 2018. Every 36 months Airmen belonging to aircrews are required to receive refresher training so they are able to survive during emergency situations in open water. (U.S. Air Force photo/Staff Sgt. Jeffrey Grossi)