Retired U.S. Naval Aircrewman Brett Parks fixes his swimming cap before his 100M Freestyle during the 2014 London Invictus Games, London Aquatics Centre, England, Sept 14, 2014. Prince Harry was driven to bring the event to an international audience following his inspirational visit to the Warrior Games in Colorado in 2013. The event in London will bring together for the first time servicemen and women – both serving and veteran – from 14 nations. The Invictus Games will spotlight the sacrifices these men and women made serving their country, and their indefatigable drive to overcome. (U.S. Air Force photo by Senior Airman Justyn M. Freeman/ Released)