Retired U.S. Army Staff Sgt. Michael Kacer, left, prepares for the 50-meter backstroke race during the swimming portion of the Invictus Games 2014 in London Sept. 14, 2014.
The Invictus Games are the United Kingdom's version of the Warrior Games, bringing together wounded veterans from 14 nations for events including track and field, archery, wheelchair basketball, road cycling, indoor rowing, wheelchair rugby, swimming, sitting volleyball and a driving challenge. (DoD photo by Senior Airman Justyn M. Freeman, U.S. Air Force/Released). Original public domain image from Flickr