Mario Rodriguez, right, a former U.S. Air Force staff sergeant and a member of the 2012 U.S. Paralympic fencing team, prepares to enter a fencing bout with Hong Kong's Wing Kin Chan as officials measure the distance between the two athletes during the Paralympic Games at the ExCeL London exhibition and convention center in London Sept. 4, 2012. The Paralympics is a major international sporting event in which thousands of athletes, including wounded and injured U.S. Service members, participate in a variety of sporting events. (U.S. Army photo by Sgt. 1st Class Tyrone C. Marshall Jr./Released)