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, , Dec. 8, 2009. Patients at Walter Reed testing next-generation prosthesis /-news/2009/12/10/31638-patients-at-walter-reed-testing-next-generation-

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Keywords: .., advanced, army, center, conflict, knee, leg, medical, microprocessor, military, physical, prosthesis, prosthetic, reed, rehabilitation, soldier, solider, stairs, therapy, training, usarmy, walking, walter, war, warrior, washington, wounded, x2