Staff Sgt. Lawrence Lin, a 89th Maintenance Group flying crew chief, inspects engine compartments of an 89th Airlift Wing C-32A Executive Transport at Travis Air Force Base, Calif., Sept. 14, 2015. As an FCC, Lin is responsible for on- and off-station maintenance of 1st Airlift Squadron C-40B Clipper and C-32A aircraft. (U.S. Air Force photo/Senior Master Sgt. Kevin Wallace)