PORT FOURCHON, La. - Army Staff Sgt. Jermaine Francis, of the 527th Engineer Battalion, Detachment 1, 844th Horizontal Company, supervises trucks and tractors for safety issues May 17, 2010 as they move rock and sand to fill gaps in the basin plains caused by past natural disasters. The U.S. Army is working in partnership with the U.S. Coast Guard, BP PLC, local residents, and other federal agencies to aid in preventing the spread of oil following the April 20 explosion on the mobile offshore drilling unit Deepwater Horizon. U.S. Navy photo by Mass Communication Specialist 2nd Class Jonathen E. Davis.