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A Marine prepares to throw a dodgeball as part of a tournament of the SEMPERFIT Summer Challenge aboard Marine Corps Recruit Depot Parris Island, August 8. The summer challenge is a program that promotes a healthy, active lifestyle and builds unit cohesion. - A Marine prepares to throw a dodgeball as part of a tournament of the SEMPERFIT Summer Challenge aboard Marine Corps Recruit Depot Parris Island, August 8. The summer challenge is a program that promotes a healthy, active lifestyle and builds unit cohesion.