LANGLEY AIR FORCE BASE, Va. -- Chief Master Sgt. Scott Dearduff, command chief for the 9th Air Force and U.S. Air Forces Central Command, speaks to 1st Security Forces Squadron personnel Sept. 12. Chief Dearduff took the tour to better understand how Langley operates and to see how Airmen carry out the everyday mission.(U.S. Air Force photo/Staff Sgt. Jeff Nevison)