Staff Sgt. Tommy Dreher, a survival, evasion, resistance and escape specialist with the 1st Special Operations Support Squadron, instructs aircrew during water survival training at Hurlburt Field, Fla., March 14, 2017. SERE specialists with the 1st SOSS instructed aircrew on three different required refresher trainings tri-annually to ensure aircrew are ready to execute operations. (U.S. Air Force photo by Airman 1st Class Joseph Pick)

An Air Commando puts on his helmet during water survival training at Hurlburt Field, Fla., March 14, 2017. Water survival training is required for aircrew tri-annually to maintain proficiency on skill sets such as canopy disentanglement, parachute drop and drag, and life raft boarding. (U.S. Air Force photo by Airman 1st Class Joseph Pick)

An aircrew member jumps into the Soundside during water survival training at Hurlburt Field, Fla., March 14, 2017. Water survival training is required for aircrew tri-annually to maintain proficiency on skill sets such as canopy disentanglement, parachute drop and drag, and life raft boarding. (U.S. Air Force photo by Airman 1st Class Joseph Pick)

Staff Sgt. Josh Clements, a special missions aviator with the 4th Special Operations Squadron, releases from a simulated parachute during water survival training at Hurlburt Field, Fla., March 14, 2017. Aircrew must participate in combat, emergency parachute and water survival training tri-annually. (U.S. Air Force photo by Airman 1st Class Joseph Pick)

An aircrew member swims under a canopy during water survival training at Hurlburt Field, Fla., March 14, 2017. Water survival training is required for aircrew tri-annually to maintain proficiency on skill sets such as canopy disentanglement, parachute drop and drag, and life raft boarding. (U.S. Air Force photo by Airman 1st Class Joseph Pick)