We're Still at War: Photo of the Day for December 14, 2009

Mon Dec. 14, 2009 7:31 AM EST

Army Reserve Staff Sgt. Alfredo De Los Santos displays what the X2 microprocessor knee prosthetic can do by walking up a flight of stairs at the Military Advanced Training Center at Walter Reed Army Medical Center in Washington, D.C., Dec. 8, 2009. (army.mil.)

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