U.S. Air Force Staff Sgt. Martinez, a military dog handler, carries Argo II, his military working dog, over railroad tracks at Hill Air Force Base, Utah, March 4, 2011. This exercise builds trust, loyalty and teamwork between Martinez and Argo, who have only been working together for two months. (DoD photo by Airman 1st Class Allen Stokes, U.S. Air Force)
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