LANGLEY AIR FORCE BASE, Va. -- Chief Master Sgt. Charles Anderson, 633d Air Base Wing command chief, and Chief Master Sgt. Terry Rethamel, Langley Chief's Group president, applaud during the unveiling of retired Chief Master Sgt. Gabriel Christie's portrait Feb. 2. Chief Christie is one of the first 625 Airmen promoted to chief master sergeant, known as "Charter Chiefs." (U.S. Air Force photo/Senior Airman Zachary Wolf)