A U.S. Army National Guard CH-47 Chinook helicopter slows to a hover as Texas Army National Guard members prepare to attach sandbag slings near Lake Pontchartrain, to be later dropped at the levee breach, in New Orleans La., on September 10, 2005. (U.S. Air Force photo by Senior Airman Chris Kerens)(Not Released) (Photo courtesy of U.S. Army; seen on http://www.visualintel.net)

A U.S. Army National Guard CH-47 Chinook helicopter slows to a hover as Texas Army National Guard members prepare to attach sandbag slings near Lake Pontchartrain, to be later dropped at the levee breach, in New Orleans La., on September 10, 2005. (U.S. Air Force photo by Senior Airman Chris Kerens)(Not Released) (Photo courtesy of U.S. Army; seen on http://www.visualintel.net)