From HSToday:

The US government has effective methodologies to identify the individual critical infrastructure assets that are the most vital to sustaining our national security — militarily, economically and otherwise. Appropriately, as these assets are identified, they are given priority for security resourcing. However, there is a strong tendency to protect these assets through a “bunker hardening” mentality which often leads to the development of security programs that do not fully acknowledge that the enemy gets a vote. This potential shortfall is effectively addressed by security and protection programs which incorporate a process of viewing our critical infrastructure assets through the prism of a sophisticated and determined adversary.