Retired Army Sgt. Brendan Marrocco was the first veteran of Iraq or Afghanistan to survive losing all four limbs, and the first to receive a double-arm transplant -- one below the elbow, the other above. Feeling is slowly returning to both arms as he undergoes intensive rehabilitation at Walter Reed National Military Medical Center. At Brigham and Women's Hospital, surgeons are planning a double arm transplant for another quadruple amputee, Will Lautzenheiser, who lost his limbs to severe infection.

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