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Participants in the 2nd Quarterly Road Race run towards the finish line aboard Marine Corps Recruit Depot Parris Island, May 22. MCCS has been hosting the Quarterly Road Races for over 14 years in support of service members and civilians aboard the Air Station and Parris Island. - Participants in the 2nd Quarterly Road Race run towards the finish line aboard Marine Corps Recruit Depot Parris Island, May 22. MCCS has been hosting the Quarterly Road Races for over 14 years in support of service members and civilians aboard the Air Station and Parris Island.