Topic: The Homeland Security Paradigm

After 9/11, we created DHS and moved way from a Civil Defense paradigm. We also merged FEMA under DHS. This was the largest shakeup and reorganization of the government since WWII.  Since 9/11, the world has changed even more.

What homeland security related law or policy do you find most useful to the cause and why?
Should homeland security include what might be deemed emergency management functions or should it only focus on terrorism, and why?
What do you see as the 3 biggest threats/hazards to our homeland and why?
What does the Bible tell us about such things?