Retired U.S. Sailor William Groulx, center, the U.S. wheelchair rugby team captain, takes a spill after a crash with a Great Britain player 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. (DoD photo by Master Sgt. Sean M. Worrell, U.S. Air Force). Original public domain image from Flickr