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In this image taken from video released by NASA, all twelve Discovery and International Space Station crew members wave during a call from President Barack Obama Thursday, March 3, 2011. From top left, Nicole Stott, Paolo Nespoli, Oleg Skripochka, Alexander Kaleri, Dmitry Kondratyev, commander Scott Kelly, Catherine Coleman, and Steve Bowen; from bottom left, Alvin Drew, pilot Eric Boe, commander Steve Lindsey, and Michael Barratt. (AP Photo/NASA)

In this image taken from video released by NASA, all twelve Discovery and International Space Station crew members wave during a call from President Barack Obama Thursday, March 3, 2011. From top left, Nicole Stott, Paolo Nespoli, Oleg Skripochka, Alexander Kaleri, Dmitry Kondratyev, commander Scott Kelly, Catherine Coleman, and Steve Bowen; from bottom left, Alvin Drew, pilot Eric Boe, commander Steve Lindsey, and Michael Barratt. (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.