Staff Sgt. Christopher Rocchio and Military Working Dog Argo, 633d Security Forces Squadron MWD section, inspect random vehicles during an Operational Readiness Exercise at Langley Air Force Base, Va., Feb. 26, 2011. SFS, along with MWD, increased random inspections of incoming personnel onto the base during the exercise for evaluation purposes. (U.S. Air Force photo by Airman 1st Class Racheal Watson/Released)