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** FILE ** Researchers prepare an unmanned aircraft system for testing at a ranch near Sarita, Texas,  Jan. 15, 2014. The drone used by Texas A&M researchers weighs about 85 pounds and has a wing span of almost 13 feet. (AP Photo/Eric Gay)

** FILE ** Researchers prepare an unmanned aircraft system for testing at a ranch near Sarita, Texas, Jan. 15, 2014. The drone used by Texas A&M researchers weighs about 85 pounds and has a wing span of almost 13 feet. (AP Photo/Eric Gay)

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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.