SAULT STE. MARIE, Mich. - Oil spill responders position containment boom in the St. Mary's River in Sault Ste. Marie, Mich., during an oil-spill response exercise there Sept. 14, 2011. The exercise - involving about 270 participants from Canadian, federal, tribal, state and local agencies - is designed to evaluate the multi-agency, international response to oil spills. (U.S. Coast Guard photo by Coast Guard Auxiliarist Dock Borth)
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