While I still think the major intent is to prepare for all possibilities with an economic crash, this Associated Press article on Yahoo today also caught my eye.

Report: Iran, Hezbollah terror threat rising
[link to news.yahoo.com]

... "While that plot highlighted a growing willingness to wage attacks in the U.S., a second, more successful plot in Bulgaria suggests that militants may be learning from their missteps."...

This would make sense why these drills in LA, Houston, Miami are being conducted at major US international port cities in conjunction with special forces.

In the end, whether driven by economics, politics, natural disaster, terrorism, or otherwise, something is going to hit the US, and with the current state of tension, its going to be very hard to contain its impacts.