U.S. Air Force Staff Sgt. Robert Sapp, 633rd Civil Engineer Squadron fire rescue crew chief, adjusts a GPS to observe water turbulence below the Langley Fire Rescue boat in Southwest Branch Back River near Langley Air Force Base, Va., Oct. 7, 2014. The boat uses sonar to sense the water’s activity so the operator can gauge driving conditions. (U.S. Air Force photo by Airman 1st Class Devin Scott Michaels/Released)