U.S. Air Force Airman 1st Class Christopher Boone, peers around a door frame during Defender Annual Refresher crucible training, Oct. 27, Travis Air Force Base, Calif. 60th SFS team members go through a 30-day period of intense training for the DART program. The teams of specially trained security forces personnel are dedicated to providing security for terrorist and criminal threat areas. (U.S. Air Force photo by Heide Couch)
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