I know this sound weird but I am paranoid as a SF resident to the possiblity of a large scale attack on San Francisco.

Recently the City of San Francisco created this program called "72 hours- Are you prepared?", which is a program promoting citizens to be prepared at leasr the first 72 hours; telling us to always store at least 3 days worth of food, water, and other things that help us to survive.
http://www.72hours.org/

The City's website, "72 hours.org" states, "After a major disaster, it is unlikely that emergency response services will be able to immediately respond to everyone’s needs, so it’s important to be prepared to take care of yourself and your family. Plan to be on your own for at least the first 72 hours."

This is amazing. While the emergency responce service are supposed to responce "immideately" to dizasters, the City alreday thinks that "it is unlikely that emergency response services will be able to immediately respond to everyone’s needs."And us residents need to be prepared for at least for 72 hours.