Matt Krumwiede/

Sgt. Matt Krumwiede works on his walking at the Center for the Intrepid at Brooke Army Medical Center in San Antonio, Texas, August 1, 2013. Krumwiede had both legs amputated and received extensive injuries to his abdomen and left arm by an IED while deployed with the US Army in Afghanistan. REUTERS/Jim Urquhart (UNITED STATES)