Staff Sgt. James Pomeroy, 62nd Aircraft Maintenance Squadron crew chief, reviews technical orders for turning power on in a C-17 Globemaster III aircraft March 20, 2017 at Joint Base Lewis-McChord, Wash. Crew chiefs are the first in the line responsibility to maintain aircraft and are responsible for ensuring aircraft are airworthy and ready to fly in moment’s notice. (U.S. Air Force photo/Senior Airman Jacob Jimenez)