Army veteran who lost both arms and legs from an IED in Iraq recovers from double arm transplant.

BETHESDA, MD - May 2: Double Arm transplant recipient, former U.S. Army Sgt. Brendan Marrocco demonstrates pull-ups during occupational therapy at the Amputee Service Advanced Training Center at Walter Reed National Military Medical Center on May 2, 2014 in Bethesda, Maryland. Marrocco was the first military service member to receive double arm transplant and the second in the U.S. to receive an above elbow transplant (his right arm). Sgt. Marrocco lost both arms and legs by an IED in 2009 in Iraq; in 2012 he received a double arm transplant at Johns Hopkins. (Photo by Michel du Cille/The Washington Post via Getty Images)