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Space shuttle Discovery lifts off from Pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Thursday, Feb. 24, 2011. Discovery, on its last mission, will carry the Leonardo Permanent Multipurpose Module, or PMM, to the International Space Station. (AP Photo/John Raoux)
Photo by: John Raoux
Space shuttle Discovery lifts off from Pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Thursday, Feb. 24, 2011. Discovery, on its last mission, will carry the Leonardo Permanent Multipurpose Module, or PMM, to the International Space Station. (AP Photo/John Raoux)

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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.