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Ringo, a 3-year-old black Labrador, is used as an off-leash bomb sniffer. He is a veteran of the war in Afghanistan. But the U.S. military now relies more on electronic sensors to do the job. (Associated Press)

Ringo, a 3-year-old black Labrador, is used as an off-leash bomb sniffer. He is a veteran of the war in Afghanistan. But the U.S. military now relies more on electronic sensors to do the job. (Associated Press)

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Best combat rifles of all time

A combat rifle is a military service rifle that fires a full-power rifle cartridge, a mainstay of every modern army in the world. See the best combat rifles ever made.