Corey Piggott, center, a Spirent Federal Systems vendor, explains new improvements in Global Positioning System technology at the Langley Club, Langley Air Force Base, Va., June 12. The semi-annual Air Combat Command Technology Expo featured 30 vendors displaying products such as communications and visual technologies. The expo brings together General Services Administration industry leaders and military personnel in order to keep Langley AFB up-to-date on emergent products. (U.S. Air Force photo by Airman 1st Class Austin C. Harvill) 120612-F-XD389-003