US Air Force (USAF) STAFF Sergeant (SSGT) Brian Fox, and USAF Technical Sergeant (TSGT) Paul Brofey, both assigned to the 12th Expeditionary Reconnaissance Squadron (ERS), use a laptop interface to perform a system check on the RQ-4A Global Hawk high-altitude, long-endurance unmanned aerial reconnaissance system at a forward location, while deployed in support of Operation ENDURING FREEDOM