24 February 2026

Regular or Unleaded? Differentiating Irregular Warfare

Chad Machiela

Department of Defense Instruction 3000.07 defines Irregular Warfare with ambiguous criteria, including indirect approaches and asymmetric activities, which are also characteristic of conventional warfare. This lack of differentiating criteria complicates planning and approval processes. To provide a clearer distinction, this article proposes adding a complementary criterion, the level of state stewardship (state authority, entitlement, and responsibility), to differentiate state, or conventional, forces from irregular forces such as private militias, criminals, and disenfranchised groups. This model also proposes a model for visualizing and categorizing operations and activities within the spectrum of irregular and conventional warfare. Recognizing the presence of irregular forces in a contest will allow commanders to better apply the specific laws, authorities, and doctrines for supporting or targeting non-state forces.

Department of Defense Instruction 3000.07, Irregular Warfare (2025), provides commanders with definitions and policy guidance to conduct irregular warfare as a complement to other joint force activities, operations, and investments in competition and conflict. This instruction describes Irregular Warfare (IW) strategies and tactics as involving force or the threat of force for purposes other than physical domination over an adversary, and states, “IW is a form of warfare where states and non-state actors campaign to assure or coerce states or other groups through indirect, non-attributable, or asymmetric activities.”

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