"Khobar Towers, like Beirut more than a decade before, had a sobering effect on the US military, the event highlighted the difficulty of protecting forces and the potentially devastating consequences of an attack. To reduce risks, force protection must become a way of life for every member of the US Armed Forces, whether stationed in the United States or abroad. It must become part of the culture or state of mind in every day operations and a central component of mission planning and execution. What is it that has changed about this mission? Some argue that while the tactics and tools of force protection have changed very little, there has been a significant change in the nature of the threat. Today's forces face a new and more complex threat: the transnational threat. Transnational adversaries appear to be growing more sophisticated and appear to be increasingly interested in inflicting mass casualties and extensive destruction. Further, the inability of these adversaries to threaten the United States with traditional military force drives them to the use of other weapons - high explosives, chemical and biological agents, and potentially even nuclear devices. Moreover, the United States is no longer a sanctuary and is vulnerable on its own soil. This trend has implications both for force protection and protection of civilians at home."
Defense Technical Information Center (DTIC): http://www.dtic.mil/dtic/