Staff Sgt. Joseph MacCarrol (left), 512th Maintenance Group fuels systems craftsman sheet metal specialist, and Master Sgt. Dale Coston, 512th MXG fuels systems shift supervisor, conduct an operational check on a valve here May 2. The two maintainers and 134 other reservists from the 512th MXG have been activated to support the troop build-up since April 5. This movement supports President Barack Obama's plan, announced in December, to push 30,000 additional U.S. troops for Operation Enduring Freedom. (U.S. Air Force photo/Senior Airman Andria J. Allmond)