Senior Airman David Skannal, wearing a full-face supplied air respirator (center), receives a wrench from Staff Sgt. Ryan Slanina (left) while Tech. Sgt. Tim Burrola looks on before inspecting the interior of the center wing fuel tank of a KC-135 Stratotanker Jan. 9 at March Air Reserve Base, Calif. Airman Skanalla is wearing the respirator so he could breathe properly while troubleshooting inside the fuel tank for leaks. All three are fuel cell technicians from the 452nd Maintenance Squadron. (U.S. Air Force photo/Val Gempis)