Petty Officer 2nd Class Tom Ross, Naval Mobile Construction Battalion 22 heavy equipment operator, drives a water truck over a gravel parking pad while Petty Officer 2nd Class Christian Rivera, NMCB 22 heavy equipment operator and team lead, watches his work at a Djibouti airfield, July 28, 2016. The water fell through the gravel, further compacting the surface and reducing dust. (U.S. Air Force photo by Staff Sgt. Benjamin Raughton/Released)