US Air Force (USAF) Technical Sergeant (TSGT) Mark Riensche uses a signal mirror to alert search and rescue forces of his location during a Combat Search and Rescue training mission conducted during Exercise DESERT RESCRE XI. The exercise is the premiere Combat Search And Rescue (CSAR) training exercise involving all branches of the US Military and is conducted at the ranges at Fallon Naval Air Station (NAS), Nevada (NV)