A Coast Guard MH-60 Jayhawk helicopter crew from Sector Columbia River's Air Station Astoria, Ore., delivers a load of concrete to awaiting Aids to Navigation Team Astoria on the Columbia River near Tongue Point in Astoria, April 27, 2013. The crews are working together to place a navigational structure on top of a rock that is submerged and not visible during most tides. (U.S. Coast Guard photo by Cmdr. Nevada Smith)
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