United States sitting volleyball player John Kremer serves during a preliminary match at the 2014 Invictus Games. Invictus Games is an international competition that brings together wounded, injured and ill service members in the spirit of friendly athletic competition. American Soldiers, Sailors, Airmen and Marines are representing the United States in the competition which is being held in London, England from Sept. 10-14. (U.S. Navy photo by Mass Communication Specialist 2nd Class Joshua D. Sheppard/Released)