Air Force Tech. Sgt. David Macdonald, 19th Security Forces Squadron kennel master, has been a service member since 2005. As a kennel master, Macdonald manages and monitors unit military working dog training.

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Photo credit: © Conner Flecks / Alamy / Afripics
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Keywords: archive, armed, defence, defenders, dog, forces, handler, k9, military, reportage, security, servicemen, usa, working