US military forces depend on electronic systems and information dominance to produce overwhelming combat power. Indeed, defense leaders are calling for development of a network-centric force to rapidly deploy and conduct decisive operations in the future security environment. Unfortunately, the information revolution embraced by the military has a dark side-it introduces a potentially catastrophic vulnerability. Electronics, the foundation of the network-centric force, are extremely vulnerable to a rapidly proliferating class of arms--electromagnetic pulse (EMP) weapons. EMP weapons come in many forms and levels of sophistication. Some can be built from readily available parts for a few hundred dollars, some require extensive techlogical expertise and research facilities, and the most effective require both the capability to build a nuclear device and the ability to launch it with a missile. While recent literature has proclaimed that the sky is falling in regard to US vulnerability to EMP, the truth is that t all EMP weapons produce catastrophic effects on all systems. The goal of this paper is to classify near-term EMP threats to US expeditionary operations in terms of their probability of use, lethal range, systems they affect, and their potential users to identify high-payoff protective measures. The paper makes specific recommendations on cost effective solutions to address the most likely and most dangerous threats.