Chief Petty Officer Christopher Sheppard, the officer in change at Coast Guard Aids to Navigation Team Astoria, talks about different light signals used by the Coast Guard during a visit from members of the Columbia River Steamship Operators Association in Astoria, Ore., Nov. 17, 2015. Members of CRSOA toured several units and learned about the Coast Guard’s many roles and missions. (U.S. Coast Guard photo by Petty Officer 3rd Class Jonathan Klingenberg)
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