Military working dogs train to perform

U.S. Air Force Staff Sgt. Roberto Matos, 52nd Security Forces Squadron military working dog trainer supervisor from San German, Puerto Rico, acts as an assailant during a K-9 demonstration at Spangdahlem Air Base, Germany, May 27, 2014. Military working dogs begin training as early as six months old and most graduate to active duty by the age of two. (U.S. Air Force photo by Senior Airman Gustavo Castillo/Released)

PHOTO BY: Senior Airman Gustavo CastilloReleased
VIRIN: 140527-F-VI983-137.JPG
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