LANGLEY AIR FORCE BASE, Va. -- Master Sgt. Robert Casagrande, Air Combat Command airborne systems chief, gives Chief Master Sgt. Scott Dearduff, command chief for 9th Air Force and U.S. Air Forces Central Command, a tour of the POW/MIA memorial Sept.11. Chief Dearduff toured Langley to better understand how the base operates and to see how Airmen carry out the everyday mission. (U.S. Air Force photo/Airman1st Class Jonathan Koob)