A Minnesota Army National Guard UH-60 Black Hawk helicopter prepares to release the sling after positioning a 3,000-pound sandbag on one of five breached levees in the Braithwaite to Scarsdale levee system in northern Plaquemines Parish, La., on Sept. 29, 2005. Department of Defense units are mobilized as part of Joint Task Force Katrina to support the Federal Emergency Management Agency's disaster-relief efforts in the Gulf Coast areas devastated by Hurricane Katrina.