Paul Parmenter demonstrates proper entry techniques to Wounded Warrior athletes during a swimming training session Aug. 4, 2014 at the U.S. Air Force Academy, Colo. The Wounded Warrior athletes are conducting their final group practices prior to the up coming Invictus Games in London Sept. 10-14 and the Warrior Games Sept. 28 through Oct. 4 2014. (U.S. Air Force photo\ Staff Sgt.Tim Chacon)