Master Sgt. Heriberto Maldonado and Tech. Sgt. Alfred Dodd perform a maintenance walk around on a C-17 Globemaster III March 3, 2017, on Joint Base Lewis-McChord, Wash. They are both flying crew chiefs, a program that started as a trial for the 446th Airlift ‘Rainier’ Wing, but is now considered essential for flying operations. (U.S. Air Force photo by David L. Yost)