Sergeant First Class Leroy Arthur Petry, U.S. Army, shows President Barack Obama

Sergeant First Class Leroy Arthur Petry, U.S. Army, shows President Barack Obama a plaque with the names of the fallen Rangers from the 75th Regiment on his prosthetic arm, during a meeting in the Oval Office, July 12, 2011. The President later awarded SFC Petry the Medal of Honor for his courageous actions during combat operations against an armed enemy in Paktya, Afghanistan, in May 2008. (Official White House Photo by Pete Souza)