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With the Sears Tower behind them, pedestrians head away from their offices in downtown Chicago, Tuesday morning, Sept. 11, 2001, in Chicago. Many Chicago buildings, including the Sears Tower, were shut down as security measures in response to the attack at the World Trade Center in New York.(AP Photo/M. Spencer Green)

With the Sears Tower behind them, pedestrians head away from their offices in downtown Chicago, Tuesday morning, Sept. 11, 2001, in Chicago. Many Chicago buildings, including the Sears Tower, were shut down as security measures in response to the attack at the World Trade Center in New York.(AP Photo/M. Spencer Green)

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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.