Airman 1st Class Caleb Bounty, 11th Civil Engineer Squadron water fuel system maintenance apprentice, completes an operational check of the base pool return line for potential chlorine leaks at Joint Base Andrews, Md., May 19, 2015. CES Airmen prepare the base pool for its slated opening of May 23. (U.S. Air Force photo/Senior Airman Joshua R. M. Dewberry)