HOUMA, La. -- The crew of a Basler BT-67 fixed wing aircraft release oil dispersant over an oil spill from the mobile offshore drilling unit, Deepwater Horizon, off the shore of Louisiana, May 5, 2010. To date, the unified response has dropped 156, 364 gallons of oil dispersant on the spill. U.S. Coast Guard photo by Petty Officer 3rd Class Stephen Lehmann.