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A health worker administers the oral polio vaccine to a newborn baby at Colvin Women's Hospital in Allahabad, India, on Thursday, Jan. 12, 2012. (AP Photo/Rajesh Kumar Singh)
Photo by: Rajesh Kumar Singh
A health worker administers the oral polio vaccine to a newborn baby at Colvin Women's Hospital in Allahabad, India, on Thursday, Jan. 12, 2012. (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.