New Orleans' motto is "Let the good times roll," but its homeland security efforts since 9-11 are anything but laissez faire. New Orleans, famed for its Mardi Gras festival--which draws 1.5 million revelers--is also home to five major universities, nuclear power plants, petroleum facilities and refineries, chemical plants, and seaports, all of which require heightened security attention in the post-9-11 threat environment. New Orleans also has infrastructure elements such as reservoirs, pipelines, and electrical power systems to protect. On top of that, says Colonel Terry Ebbert, director of New Orleans' Homeland Security and Public Safety Department, "We're the only city...