Coast guardsmen instruct a crewmember of the Environmental Protection Agency's research vessel Lake Guardian on how to operate the Vessel of Opportunity Oil Skimming System during a VOSS demonstration aboard the Lady Guardian in Cleveland Harbor on Lake Erie, Sept. 12, 2012. Coast Guardsmen and representatives of the EPA Region V outfitted the Lake Gaurdian to carry the VoSS, which is designed to assist in the event of an oil spill in the Great Lakes. (U.S. Coast Guard photo by Petty Officer 2nd Class Levi Read)