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Associated Press
This frame grab from NASA-TV shows space shuttle Atlantis docked at the International Space Station on Sunday. Atlantis' current supply visit marks the final shuttle mission by NASA.

Associated Press This frame grab from NASA-TV shows space shuttle Atlantis docked at the International Space Station on Sunday. Atlantis' current supply visit marks the final shuttle mission by 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.