Retired U.S. sailor William Groulx, left, the U.S. wheelchair rugby team captain, heads toward the goal to score a point against the Great Britain team during a match at the Paralympic Games in London Sept. 5, 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. Air Force photo by Master Sgt. Sean M. Worrell/Released)