Airman 1st Class Benjamin Davis, 168th Fuel System Maintenance shop fuel system mechanic, prepares his tool bag before climbing into a fuel tank in the wing of a KC-135, March 10, 2015. The fuel shop Airmen take turns working and inspecting each other’s work. Manifolds — a collection of pipes funneling fuel from one tank to another — are removed and installed in layers, said Master Sgt. Fred Adams, 168th Fuel System Maintenance shop supervisor. It is difficult to correct any errors if Airmen wait until all the manifolds are installed, he said.