JACKSONVILLE, Fla. - Seaman Zack Treece, a crewmember aboard the 175-foot Coast Guard Cutter Maria Bray, inspects a lamp changer on a 155-mm lantern during buoy evolutions on the St. John's River Wednesday, Oct. 5, 2011. When properly maintained, buoys serve as a critical infrastructure to mariners while transiting the waterways. U.S. Coast Guard photo by Petty Officer 3rd Class Jessica Potter.
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