Catastrophic Emergency

HSNSPD
Homeland Security-National Security Presidential Directive

"Catastrophic Emergency" means any incident, regardless of location, that results in extraordinary levels of mass casualties, damage, or disruption severely affecting the U.S. population, infrastructure, environment, economy, or government functions;

"Primary Mission Essential Functions," or "PMEFs," means those Government Functions that must be performed in order to support or implement the performance of NEFs before, during, and in the aftermath of an emergency.

http://www.whitehouse.gov/news/releases/2007/05/20070509-12....

White House revises post-disaster protocol
The policy requires all government agencies to have clear lines of succession if top officials are killed and be prepared to operate from a new headquarters within 12 hours of a catastrophe. They must be prepared "to lead and sustain the nation during a crisis"

"Bush quietly signed the new policy on May 4, 2007"
http://www.boston.com/news/nation/washington/articles/2007/0...

found via
http://tampasbackdoor.blogspot.com/2007/06/bush-has-singleha...