This document is part of The National Strategy for the Physical Protection of Critical Infrastructures and Key Assets. This document outlines what must be done to safeguard the various categories of key assets. Key assets represent a broad array of unique facilities, sites, and structures whose disruption or destruction could have significant consequences across multiple dimensions. The sites and structures that make up this key asset category typically draw large amounts of tourism and frequent media attention factors that impose additional protection challenges. Another category of key assets includes facilities and structures that represent our national economic power and technological advancement.
The White House: http://www.whitehouse.gov/
National Strategy for the Physical Protection of Critical Infrastructures and Key Assets (February 2003), p.71