Tech. Sgt. Percy Padilla uses a grinder to shape a metal part. U.S. Air Force Tech. Sgt. Percy Padilla uses a grinder to shape a metal part at March Air Reserve Base, Calif., on Sept. 17, 2008. Padilla is a metals technician from the 452nd Maintenance Squadron. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 365480-S-HGN59-149.jpg Photo Gallery