ANDERSEN AIR FORCE BASE, Guam - Capt. Benjamin Hall, 36th Medical Group officer in charge of Dental Radiology, aligns the X-ray machine with the sensor that is placed in Airman 1st Class Keesha Harris's mouth here Dec. 5. Radiation exposure drops 50 percent by using digital radiology over film. (U.S. Air Force photo by Airman 1st Class Courtney Witt)