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Irregular warfare favors indirect and asymmetric warfare approaches, though it may employ the full range of military and other capabilities, in order to erode the adversary’s power, influence, and will. It is inherently a protracted struggle that will test the resolve of a state and its strategic partners. Concepts associated with irregular warfare are older than the term itself.
Origination of the term
The distinction between regular and irregular forces is unrelated to the term "irregular warfare." The term, irregular warfare, was settled upon in distinction from "traditional warfare" and "unconventional warfare", and to differentiate it as such.
One of the earliest known uses of the term irregular warfare is in the 1986 English edition of "Modern Irregular Warfare in Defense Policy and as a Military Phenomenon" by Friedrich August Freiherr von der Heydte. The original 1972 German edition of the book is titled "Der Moderne Kleinkrieg als Wehrpolitisches und Militarisches Phänomen". The German word "Kleinkrieg" is literally translated as "Small War". The word "Irregular", used in the title of the English translation of the book, seems to be a reference non "regular armed forces" as per the aforementioned Third Geneva Convention.
US DoD use
One of the earliest known uses of the term IW is in a 1996 Central Intelligence Agency document by Jeffrey B. White. Major military doctrine developments related to IW were done between 2004 and 2007 as a result of the September 11 attacks on the United States. A key proponent of IW within US DoD is Michael G. Vickers, a former paramilitary officer in the CIA.
US CIA use
The CIA's Special Activities Division (SAD) is the premiere[clarification needed] unit for unconventional warfare, both for creating and for combating irregular warfare units. For example, SAD paramilitary officers created and led successful irregular units from the Hmong tribe during the war in Laos in the 1960s from the Northern Alliance against the Taliban during the war in Afghanistan in 2001 and from the Kurdish Peshmerga against Ansar al-Islam and the forces of Saddam Hussein during the war in Iraq in 2003.
- IW is a form of warfare that has as its objective the credibility and/or legitimacy of the relevant political authority with the goal of undermining or supporting that authority. IW favors indirect approaches, though it may employ the full range of military and other capabilities to seek asymmetric approaches, in order to erode an adversary’s power, influence, and will.
- IW is defined as a violent struggle among state and non-state actors for legitimacy and influence over the relevant population(s)
- IW involves conflicts in which enemy combatants are not regular military forces of nation-states.
- IW is "war among the people" as opposed to "industrial war" (i.e. regular war).
Activities and types of conflict included in IW are:
- Colonial war
- Asymmetric warfare
- Insurgency/Counter-insurgency (COIN)
- Stabilization, Security, Transition, and Reconstruction Operations (SSTRO)
- Unconventional warfare (UW)
- Guerrilla warfare (GW)
- Foreign internal defense (FID)
- Civil-military operations (CMO)
- Military Intelligence and counter-intelligence activities
- Transnational criminal activities that support or sustain IW:
- Law enforcement activities focused on countering irregular adversaries
According to the DoD, there are five core activities of IW:
- Counter-insurgency (COIN)
- Counter-terrorism (CT)
- Unconventional warfare (UW)
- Foreign internal defense (FID)
- Stability Operations (SO)
Nearly all modern wars include at least some element of irregular warfare. Since the time of Napoleon, approximately 80% of conflict has been irregular in nature. However, the following conflicts may be considered to have exemplified by irregular warfare:
- Afghan Civil War
- Algerian War
- American Indian Wars
- American Revolutionary War[nb 1]
- Arab Revolt
- Chinese Civil War
- Cuban Revolution
- First Chechen War
- First Sudanese Civil War
- Iraq War
- Kosovo War
- Lebanese Civil War
- Portuguese Colonial War
- Rwanda Civil War
- Second Boer War
- Second Chechen War
- Second Sudanese Civil War
- Somali Civil War
- Philippines War
- Vietnam War
Wargames and exercises
- Unified Action 
- Unified Quest 
- January 2010 Tri-Service Maritime Workshop,
- Joint Irregular Warrior Series war games,
- Expeditionary Warrior war game series, and
- a December 2011 Naval War College Maritime Stability Operations Game focused specifically on stability operations in the maritime domain conducted by the Naval Service.
Modeling and simulation
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- Che Guevara
- Clarence Ransom Edwards
- François Géré
- Friedrich August Freiherr von der Heydte
- John R. M. Taylor
- T. E. Lawrence
- Michael G. Vickers
- Robert Rogers' 28 "Rules of Ranging"
- According to the definition of "regular forces", which came much after the American Revolutionary War (ARW), the American forces did not meet the following criteria at all times during the ARW:
- having a fixed distinctive emblem recognizable at a distance
- carrying arms openly
- conducting operations in accordance with the laws and customs of war
Notwithstanding, in terms of modern international humanitarian law which was also developed much later than the ARW, the American forces formed part of the armed forces of a party to an armed conflict but not belonging to that party's regular forces (since the United States of America did not exist and hence could not have had regular forces; the American forces were an insurgency at least until 1776) and operating in or outside of their own territory even if the territory is under occupation. American forces did become regular forces but cannot be considered regular forces during the entire period of the ARW. For example, the American flag got established (1777) 2 years after the ARW started (1775). Also, there were great disparities between the American and British forces. It was not until France started to assist American forces (1778) that the disparity started to be narrowed. Conflict during the disparity surely counts as Asymmetric warfare. Also, the Boston Tea Party (1773) can be viewed as guerrilla tactics. At the very least, a good portion of the ARW should be counted as IW although the entire ARW being counted as IW is controversial. However, since more than 1/2 of the ARW was fought as ARW then it is thought that it is safe to classify it as IW even though that the American forces acted in all respects as regular forces towards the end of the conflict.
- The Irregular Warrior, 4 October 2015 
- "Irregular Warfare (IW) Joint Operating Concept (JOC)", Version 1.0, United States Department of Defense, 27 February 2009 
- "US Irregular Warfare (IW) Analysis Workshop", Military Operations Research Society (MORS), 11 September 2007 
- "Irregular Warfare (IW)", DoD Directive 3000.07, United States Department of Defense, 1 December 2008 
- "Quadrennial Roles & Missions (QRM) Review Report", United States Department of Defense, January 2009 
- "Irregular Warfare", Doctrine Document 2-3, United States Air Force, 1 August 2007 
- Gates, John M., "The U.S. Army and Irregular Warfare", The College of Wooster "Archived copy". Archived from the original on 2009-06-23. Retrieved 2010-02-20.CS1 maint: Archived copy as title (link)
- Moses, A. Dirk, "German intellectuals and the Nazi past," ISBN 978-0-521-86495-4, 2007 
- White, Jeffrey B., "A Different Kind of Threat, Some Thoughts on Irregular Warfare", CIA, 1996 
- "The National Military Strategy of the United States of America", United States Department of Defense, 2004 
- Miller, LTC Frank A., "Irregular Warfare – Perhaps Not So "Irregular"", U.S. Army War College, 15 March 2006 
- "The National Security Strategy of the United States of America", National Security Council, 2002 
- Grant, Greg, "The Man Behind Irregular Warfare Push: Mike Vickers", DoD BUZZ, 7 April 2009 
- Southworth, Samuel A., Tanner, Stephen, U.S. Special Forces: A Guide to America's Special Operations Units: the World's Most Elite Fighting Force, Da Capo Press, ISBN 0-306-81165-0, 2002
- "Waller, Douglas, "The CIA Secret Army", Time Inc., 3 February 2003". time.com.
- Stone, Kathryn & Williams, Anthony R., All Necessary Means: Employing CIA operatives in a Warfighting Role Alongside Special Operations Forces, United States Army War College (USAWC), 7 April 2003
- Shooting at the Moon: The Story of America's Clandestine War in Laos, Steerforth Press, ISBN 978-1-883642-36-5, 1996
- Woodward, Bob, Bush at War, Simon and Schuster, ISBN 0-7432-0473-5, 19 November 2002
- Tucker, Mike & Faddis, Charles, Operation Hotel California: The Clandestine War inside Iraq, The Lyons Press, ISBN 978-1-59921-366-8, 2008
- Woodward, Bob, Plan of Attack, Simon and Schuster, ISBN 978-0-7432-5547-9, 2004
- "Irregular Warfare Special Study", United States Joint Forces Command Joint Warfighting Center, 4 August 2006 
- "Quadrennial Defense Review Report", United States Department of Defense, 6 February 2006 
- Benest, David, "British Leaders and Irregular Warfare," 29 August 2007
- The Core Activities of Irregular Warfare, The Irregular Warrior, 
- The Imperitive: Irregular Warfare and the Future of Security, The Irregular Warrior, 
- Marston, Daniel (2002). The American Revolution 1774-1783. Osprey Publishing. ISBN 978-1-84176-343-9.
- "Maritime Stability Operations - PDF". docplayer.net. Retrieved 2017-09-07.
- "U. S. Army Enhancement of Irregular Warfare Modeling & Simulation", United States Army Modeling and Simulation Office, 24 February 2009 
- "MORS Workshop Irregular Warfare (IW) II Analysis Workshop", Military Operations Research Society, 3–6 February 2009 
- Cragg, Lt. Jennifer, "Behavior Studies May Improve Irregular Warfare Techniques", American Forces Press Service, 20 April 2009 
|Look up Irregular Warfare in Wiktionary, the free dictionary.|
- Military Art and Science Major - Irregular Warfare Specialty Track 
- Pincus, Walter, "Irregular Warfare, Both Future and Present", The Washington Post, 7 April 2008 
- Phillips, Joan T., Fairchild, Muir S.,"Irregular Warfare", Maxwell Air Force Base, March 2007 
- Gustafson, Michael, "Modern Irregular Warfare & Counterinsurgency", Swedish National Defence College, 2009 
- Coons, Kenneth C. Jr., Harned, Glenn M., "Irregular Warfare is Warfare", Joint Force Quarterly, National Defense University, 2009 
- Naval Postgraduate School (NPS) Center on Terrorism and Irregular Warfare (CTIW) 
- United States Joint Forces Command (USJFCOM) Joint Irregular Warfare Center (JIWC) 
- Armed Groups and Irregular Warfare; Adapting Professional Military Education, Richard H. Shultz, Jr., Roy Godson, and Querine Hanlon (Washington, DC: National Strategy Information Center, 2009). 
- Tomkins, Paul, Irregular Warfare: Annotated Bibliography. Fort Bragg, NC: United States Army Special Operations Command, 2011.