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This image released by NASA on Wednesday, Aug. 8, 2012, and taken by cameras aboard the Curiosity rover shows the Martian horizon. (AP Photo/NASA)
Photo by: HOPD
This image released by NASA on Wednesday, Aug. 8, 2012, and taken by cameras aboard the Curiosity rover shows the Martian horizon. (AP Photo/NASA)

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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.