Soldiers participate in physical therapy while using a prosthetic brace called the Intrepid Dynamic Exoskeletal Orthosis (IDEO), which allows them to use and strengthen severely injured legs. John Moore/Getty Images hide caption

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Members of the US Army's Old Guard carry team lift the remains of U.S. Army Specialist Israel Candelaria Mejias from San Lorenzo, Puerto Rico, as his body is returned on a C-17 to the U.S. from Iraq on April 7, 2009. Paul J. Richards /AFP/Getty Images hide caption

itoggle caption Paul J. Richards /AFP/Getty Images