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An Indian medical volunteer administers polio immunization drops to a child at a railway station in Allahabad, India, Monday, Jan. 13, 2014. India on Monday marked three years since its last polio case was reported, a major milestone in eradicating the crippling disease. (AP Photo/Rajesh Kumar Singh)

An Indian medical volunteer administers polio immunization drops to a child at a railway station in Allahabad, India, Monday, Jan. 13, 2014. India on Monday marked three years since its last polio case was reported, a major milestone in eradicating the crippling disease. (AP Photo/Rajesh Kumar Singh)

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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.