At Clark Air Base, Philippine Air Force Tech. Sgt. Joselito Penalba, left, a maintenance crew chief with the 15th Strike Wing, explains the capabilities of an OV-10 B fighter plane to U.S. Marines from Marine Attack Squadron VMA 513, 31st Marine Expeditionary Unit, Feb. 20, during Balikatan 2008. (Photo by Staff Sgt. Marc Ayalin)