This report provides study results, analysis, conclusions, and recommendations concerning doctrinal implications of Irregular Warfare (IW) as introduced/described in the 2006 Quadrennial Defense Review report. Specifically, this study identifies current joint doctrinal treatment of IW and its aspects, to include content of ongoing revision efforts; identifies any joint doctrinal voids concerning IW and proposes courses of action for resolving identified voids; and identifies terminology mplications/doctrinal issues related to IW.