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Rep. Gabrielle Giffords and her husband, retired Navy Capt. Mark Kelly, walk on the Davidson Canyon Gabe Zimmerman Memorial Trailhead on Saturday, Jan. 7, 2012, to pay tribute to Zimmerman, who was killed a year ago during the Tucson shooting. Zimmerman was the director of community outreach for Mrs. Giffords. (AP Photo/The Arizona Republic, Cheryl Evans)
Photo by: Cheryl Evans
Rep. Gabrielle Giffords and her husband, retired Navy Capt. Mark Kelly, walk on the Davidson Canyon Gabe Zimmerman Memorial Trailhead on Saturday, Jan. 7, 2012, to pay tribute to Zimmerman, who was killed a year ago during the Tucson shooting. Zimmerman was the director of community outreach for Mrs. Giffords. (AP Photo/The Arizona Republic, Cheryl Evans)

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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.