Security is an imperfect art; even on the best day it cannot remove all aspects of danger or risk from an environment, especially during a crisis. This is mainly due to the fact that security plans, strategies and tactics are all generated by human beings and all humans are flawed. However, it is always better to have a plan and not need it than to need a plan and not have it. The world today is an extremely dangerous and unpredictable place even on a calm day.