Retired Masters-at-Arms 3rd Class Nathan DeWalt recovers from an exhausting swim at Joint Base Pearl Harbor's Scott Pool during a practice session for the scheduled Wounded Warrior Pacific Invitational in Honolulu, Jan. 8-10. WWPI is a competition among seriously wounded, ill and wounded service members from the Air Force, Army, Coast Guard, Navy and Special Operations Command. The WWPI is the largest joint-service competition to take place outside the annual Warrior Games.