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GULF OF MEXICO — Homeland Security (DHS) Secretary Janet Napolitano surveys the oil sheen in the Gulf of Mexico, Friday, April 30, 2010 aboard a Coast Guard HC-144A Ocean Sentry aircraft. Efforts to stop the flow of oil and minimize the impact to environmental and economic resources has been underway since the incident occurred April 20, 2010. U.S. Coast Guard photo by Petty Officer 3rd Class Cory J. Mendenhall.