Army Sgt. Brendan Marrocco, a quadruple amputee who lost his limbs in Iraq, is the first soldier to receive a double arm transplant, and only the seventh successful U.S. recipient. Surgeons at Johns Hopkins Hospital in Baltimore attached two cadaver arms to Marrocco in December. He is able to grab a tennis ball and move his arms, but doctors expect it to take up to two years for him to regain feeling down to his fingertips.

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