Zack, one of the 9th Security Forces Squadron's newest military working dogs, walks the center line of an abandoned road on Beale AFB during a ruck march Jan. 9, 2012. Each member of the military working dog flight marches at least once a week while keeping up with other training requirements as well as care and maintenance of the animals and kennels. (U.S Air Force photo by Senior Airman Shawn Nickel/Released)
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