U.S. Air Force Senior Master Sgt. Mark Zickefoose, 910th Operations Group aerial spray technician, checks the pressure levels of the Modular Aerial Spray System onboard a modified C-130 Hercules, assigned to the 757th Airlift Squadron, at Joint Base Langley-Eustis, Va., Aug. 1, 2017. The 757th Airlift Squadron is the only unit which carries out an aerial spraying mission in the Department of Defense, covering all stateside bases for Joint Service readiness. (U.S. Air Force photo/Staff Sgt. Carlin Leslie)