Cargo Chains Air Force Airman 1st Class Matthew Martinez tightens cargo chains onto a truck at Osan Air Base, South Korea, Sept. 6, 2017. Martinez is a vehicle operator assigned to the 51st Logistics Readiness Squadron. Air Force photo by Staff Sgt. Franklin R. Ramos SHARE: Download: Full Size (0.8 MB) Credit: Senior Airman Franklin Ramos VIRIN: 170906-F-FV476-0169C.JPG Photo Gallery