U.S. Air Force Maj. Eric Hendrickson, Air Combat Command Training Support Squadron aerospace physiology program manager, swims laps during his lunch break at the Joint Base Langley-Eustis Shellbank Fitness Center Indoor Pool, Nov. 12, 2014. Hendrickson swims laps once a week as a part of his fitness program. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)

Charles Burnette, NASA engineering technician, swims laps at the Joint Base Langley-Eustis Shellbank Fitness Center Indoor Pool, Nov. 12, 2014. Burnett swims competitively and practices for swim meets at the Shellbank pool. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)

The Joint Base Langley Eustis Shellbank Fitness Center Indoor Pool is manned by a life guard, who also teaches fitness classes and is trained in first aid. The pool is open year-round for fitness swimming and offers lessons as well as aerobics classes. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)

Joint Base Langley Eustis Shellbank Fitness Center Indoor Pool patrons swim laps, Nov. 12, 2014. The pool is open to military and Department of Defense ID cardholders 6-10 a.m. and 11 a.m. - 1 p.m. Monday – Thursday, and 6 a.m.-10a.m. Friday. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released) )

The Joint Base Langley Eustis Shellbank Fitness Center Indoor Pool lifeguard uses free-agents to test the pool’s chlorine level at the indoor pool, Nov. 12, 2014. White checks the pools temperature and the chlorine levels every two hours during operating hours to ensure safe swimming conditions for patrons. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)