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Anopposing force (alternativelyenemy force, abbreviatedOPFOR orOpFor) is amilitary unit tasked with representing an enemy, usually for training purposes inwar game scenarios. The related concept ofaggressor squadron is used by some air forces.

At a basic level, a unit might serve as an opposing force for a single scenario, differing from its 'opponents' only in the objectives it is given. However, major armies commonly maintain specialized groups trained to accurately replicate real-life enemies, to provide a more realistic experience for their training opponents. (To avoid the diplomatic ramifications of naming a real nation as a likely enemy, training scenarios often use fictionalized versions with different names but similar military characteristics to the expected real-world foes.)

The Canadian Armed Forces has OPFOR units from theCanadian Manoeuvre Training Centre.^[1]

In theFrench Army, a FORAD (FORce ADverse, enemy force) is used to train the army, in both thecentre d'entraînement au combat (CENTAC, Combat Training Center) ofMailly-le-Camp^[2] and in thecentre d'entraînement aux actions en zone urbaine (CENZUB, Urban Operations Training Centre).^[3] DeclassedAMX-30 tanks were used to simulate Soviet T-72s,^[2] until 2018.^[4]

There are three major training centers that utilize home-based OPFOR units for theUS Army:

• TheNational Training Center (NTC) atFort Irwin, California—home unit is the11th Armored Cavalry Regiment (theBlackhorse)^[5]
• The Joint Readiness Training Center (JRTC) atFort Johnson, Louisiana—home unit is the 1st Battalion, 509th Parachute Infantry Regiment (theGeronimos)^[6]
• TheJoint Multinational Readiness Center (JMRC)—formerly known as the Combat Maneuver Training Center (CMTC)—at Hohenfels, Germany^[7]—home unit is the 1st Battalion,4th Infantry Regiment (Separate) (theWarriors)

Various US military installations or major units have their own local versions of opposing force used for training exercises. The joint Australian–US military exercise "Crocodile '03" featured an Australian-led opposing force in which soldiers from a range of Australian units worked together with aUS Marine Corps contingent.^[8]

Severalstate defense forces have served as OPFOR units when training with theNational Guard. TheCalifornia State Guard,^[9] theGeorgia State Defense Force,^[10] and theNew York Guard^[11] have provided OPFOR services to their respective National Guard counterparts. In 2018, the Georgia State Defense Force established the OPFOR Battalion^[12] to assist National Guard Soldiers with pre-deployment training.

Officer ranks

Rank group	General / flag officers										Senior officers						Junior officers
Circle Trigonists Army (1953–1962)[13]
	Marshal		General of army		General of corps		General of division		General of brigade		Colonel		Commandant		Major		Captain		Lieutenant		Sub-lieutenant		Warrant officer
Circle Trigonists Army (1962–1978)[14]
	Marshal		General of army		General of corps		General of division		General of brigade		Colonel		Commandant		Major		Captain		Lieutenant		Sub-lieutenant		Warrant officer
Rank group	General / flag officers										Senior officers						Junior officers
Circle Trigonists Air Force (1953–1962)[15]
	Air marshal		General of air		General of air army		General of air corps		General of air division		Colonel		Commandant		Major		Captain		Lieutenant		Sub-lieutenant		Warrant officer
Circle Trigonists Air Force (1962–1978)[16]
	Air marshal		General of air		General of air army		General of air corps		General of air division		Colonel		Commandant		Major		Captain		Lieutenant		Sub-lieutenant		Warrant officer

Other ranks

Rank group	Senior NCOs																						Junior NCOs						Enlisted
Circle Trigonists Army (1953–1962)[17]																													No insignia
	Sergeant major						Staff sergeant		Senior sergeant		Platoon sergeant						Section sergeant						Corporal				Senior private		Private
Circle Trigonists Army (1962–1978)[18]																													No insignia
	Sergeant major						Staff sergeant		Senior sergeant		Platoon sergeant						Section sergeant						Corporal				Senior private		Private
Rank group	Senior NCOs																						Junior NCOs						Enlisted
Circle Trigonists Air Force (1953–1962)[19]																													No insignia
	Sergeant major						Staff sergeant		Senior sergeant		Platoon sergeant						Section sergeant						Corporal				Senior airman		Airman
Circle Trigonists Air Force (1962–1978)[18]																													No insignia
	Sergeant major						Staff sergeant		Senior sergeant		Platoon sergeant						Section sergeant						Corporal				Senior airman		Airman

• 
  49th Royal Tank RegimentMatilda II with swastika and Iron Cross markings to denote opposing force status during a 1941 exercise in Dover.
• 
  Dutch soldiers of11 Pantserinfanteriebataljon Garderegiment Grenadiers wearing mohawk-style additions on their helmets to denote opposing force status.
• 
  New Zealand Defence Force soldier denoting opposing force status by wearing DesertDisruptive Pattern Material (DPM) in a temperate environment.
• 
  Scene from a simulatedRoyal Marines beach landing during the 2009Bournemouth Air Festival; "opposing force" Marine is bareheaded and wears Desert DPM, "blue force" Marines in the background wear berets, camouflage face paint, and woodland DPM.
• 
  Royal Marine "opposing force" members during a 2016 assault demonstration; they wearTropentarn uniforms and soft hats while the assaulting "blue force" Marines would be wearingMTP uniforms withMk 7 helmets.
• 
  A sniper from the FrenchCENZUB opposing force wearing a blue-and-gray version ofCamouflage Central-Europe.
• 
  51st Fighter Wing airman denoting opposing force status by wearing hisBattle Dress Uniform back to front (note the contrast of the uniform with theindividual integrated fighting system vest that is also being worn).
• 
  4th Infantry Regiment soldiers wearing United States Army opposing force uniform (Battle Dress Uniform in black with olive 'OPFOR' shoulder title)
• 
  An OSV replicating a Soviet BMP at NTC, Fort Irwin, CA
• 
  US Marines using a formerSovietMT-LB vehicle as part of the OPFOR during an exercise
• 
  Michigan National Guard OPFOR wearingtiger stripe camouflage uniform and carrying a simulatedRPG-7.
• 
  OPFOR rank insignia mimicking the Soviet style (used during theCold War)
• 
  T-72M1 used by the 3rd Amphibious Assault Battalion,1st Marine Division of US Marines atCamp Pendleton during Kernel Blitz 1997 exercise

Wikimedia Commons has media related toOpposing forces.

• Validating the "Enemy" (discusses the United States Army OPFOR units and post-Cold War changes to OPFOR.)
• The Circle Trigonists (Aggressors), a summary of the opposing force Aggressor used by the United States Army from ca. 1946–1978

• Military education and training

• CS1 French-language sources (fr)
• Articles with short description
• Short description is different from Wikidata
• Articles needing additional references from November 2009
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• Articles containing French-language text
• Commons category link is on Wikidata