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Former Sen. John Glenn (left) and Scott Carpenter, the last surviving Mercury astronauts, speak at the Kennedy Space Center on Friday, Feb. 17, 2012, in Cape Canaveral, Fla., during an event marking the 50th anniversary of Mr. Glenn's launch into orbit. (AP Photo/Michael Brown)
Photo by: Michael Brown
Former Sen. John Glenn (left) and Scott Carpenter, the last surviving Mercury astronauts, speak at the Kennedy Space Center on Friday, Feb. 17, 2012, in Cape Canaveral, Fla., during an event marking the 50th anniversary of Mr. Glenn's launch into orbit. (AP Photo/Michael Brown)

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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.