BAGRAM AIRFIELD, Afghanistan -- Staff Sgt. Ulises Gonzalez, 455th Expeditionary Security Forces Group dog trainer, practices some "patrol training" with Mayo, a military working dog, here, Dec. 21, 2012. The training demonstrates the MWD's ability to attack, on command, any perpetrator that is being uncooperative or attempting to cause harm toward property or personnel. Gonzalez is deployed from Kirtland Air Force Base. (U.S. Air Force photo/Senior Airman Chris Willis)