Pool Perseverance Marine Corps veteran Tisha Knickerbocker swims breaststroke during the 2018 Department of Defense Warrior Games swimming competition at the U.S. Air Force Academy in Colorado Springs, Colo. June 8, 2018. DoD photo by EJ Hersom SHARE: Download: Full Size (1.52 MB) Tags: wounded warriors, Veterans, Marine Corps, Warrior Games 2018, Warrior Games 2018 Special Credit: EJ Hersom VIRIN: 180608-D-DB155-004.JPG Photo Gallery