Senior Airman Christine Colon, assigned to the 6th Aerospace Medicine Squadron, passes a bag of shells to Senior Airman Willie Mcelroy, assigned to the 6th AMDS, during an oyster reef building at MacDill Air Force Base, Fla., Dec. 11, 2015. Colon and Mcelroy helped gather, bag, transport and use 14 tons of shells to build an oyster reef along the shoreline. (U.S. Air Force photo by Senior Airman Vernon L. Fowler Jr./Released)

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