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Health and Human Services Secretary Kathleen Sebelius delivers the keynote speech at the opening of the University of Colorado's annual Conference on World Affairs, in Boulder, Colo., on Monday, April 7, 2014. (AP Photo/Brennan Linsley)

Health and Human Services Secretary Kathleen Sebelius delivers the keynote speech at the opening of the University of Colorado's annual Conference on World Affairs, in Boulder, Colo., on Monday, April 7, 2014. (AP Photo/Brennan Linsley)

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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.