If the nightmare of an avian flu pandemic emerges from the dark chapters of doomsday scenarios, it will fall to the Department of the Homeland Security, not the medical establishment, to manage the crisis, according to federal documents and interviews with government officials. Under the National Response Plan, which also plans for actions in case of pandemics, DHS assumes top authority when an incident of national significance" is declared. The first such "incident of national significance" was declared in August after Hurricane Katrina hit; however, federal coordination among agencies and state and local governments broke down on so many levels that even President Bush was forced to acknowledge that the plan was flawed. Federal officials have been role playing different flu outbreak scenarios for the past several months. Last year's plan called for closing of schools, restricting travel and...lock-down quarantine measures. Those extreme measures jumped into the spotlight...when President Bush suggested that federal military troops -- not just the National Guard -- may have to be called in to enforce a quarantine.