Strategic Competition and Resistance in the 21st Century: Irregular, Catastrophic, Traditional, and Hybrid Challenges in Context
Mr Nathan P Freier
Monograph by the US Army War College, Strategic Studies Institute
"The 2005 National Defense Strategy (NDS 05)
introduced the concept of the four challenges—traditional, irregular, catastrophic, and disruptive. However, since the strategy’s publication in March 2005, little has emerged in the way of specific amplification of these concepts. Reference to the challenges is prolific in both formal and informal defense deliberations. Yet, there has always been some need for greater richness and granularity in their description and application in defense strategy and policymaking.
For three of the four challenges, the wait is over. This monograph describes the foundational substance of the traditional, irregular, and catastrophic challenges as they were conceived at the working-level during development of NDS 05."