Senior Airman Timothy Butler, 374th Maintenance Squadron fabrication flight aircraft structural maintainer, installs high locks on a C-130 Hercules bulkhead at Yokota Air Base, Japan, Oct. 19. Butler, along with six other structural maintainers, removed and repaired four bulkheads for an inspection. (U.S. Air Force photo/Airman 1st Class Krystal M. Garrett)