Cpl. Casey Chang, 21, dog handler, Detroit, Mich., takes care of Tank. Tank is a military working dog that is trained to detect military and home made explosives. Chang, assigned to 2nd Battalion, 4th Marines completed a 6-week training course in order to understand the needs and training for his dog.

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Cpl. Casey Chang, 21, dog handler, Detroit, Mich., takes care of Tank. Tank is a military working dog that is trained to detect military and home made explosives. Chang, assigned to 2nd Battalion, 4th Marines completed a 6-week training course in order to understand the needs and training for his dog.

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