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An opposing force (alternatively enemy force, abbreviated OPFOR or OpFor) is a military unit tasked with representing an enemy, usually for training purposes in war game scenarios. The related concept of aggressor 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.)

Units

Canada

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

China

France

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

Japan

United States

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

The National Training Center or NTC at Fort Irwin, California—home unit is the 11th Armored Cavalry Regiment (the Blackhorse)^[5]
The Joint Readiness Training Center or JRTC at Fort Johnson, Louisiana—home unit is the 1st Battalion, 509th Parachute Infantry Regiment (the Geronimos)^[6]
The Joint Multinational Readiness Center or JMRC (formerly known as the Combat Maneuver Training Center or CMTC) at Hohenfels, Germany^[7]—home unit is the 1st Battalion, 4th Infantry Regiment (Separate) (the Warriors)

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 a US Marine Corps contingent.^[8]

Several state defense forces have served as OPFOR units when training with the National Guard. The California State Guard,^[9] the Georgia State Defense Force,^[10] and the New 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.

Ranks

Officer ranks

Rank group	General / flag officers					Senior officers			Junior officers
Aggressor Army (1953–1962)^[13]
Aggressor 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
Aggressor Army (1962–?)^[14]
Aggressor Army (1962–?)^[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
Aggressor Air Force (1953–1962)^[15]
Aggressor 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
Aggressor Air Force (1962–?)^[16]
Aggressor Air Force (1962–?)^[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
Aggressor Army (1953–1962)^[17]								No insignia
Aggressor Army (1953–1962)^[17]	Sergeant major	Staff sergeant	Senior sergeant	Platoon sergeant	Section sergeant	Corporal	Senior private	Private
Aggressor Army (1962–?)^[18]								No insignia
Aggressor Army (1962–?)^[18]	Sergeant major	Staff sergeant	Senior sergeant	Platoon sergeant	Section sergeant	Corporal	Senior private	Private
Rank group	Senior NCOs					Junior NCOs		Enlisted
Aggressor Air Force (1953–1962)^[19]								No insignia
Aggressor Air Force (1953–1962)^[19]	Sergeant major	Staff sergeant	Senior sergeant	Platoon sergeant	Section sergeant	Corporal	Senior airman	Airman
Aggressor Air Force (1962–?)^[20]								No insignia
Aggressor Air Force (1962–?)^[20]	Sergeant major	Staff sergeant	Senior sergeant	Platoon sergeant	Section sergeant	Corporal	Senior airman	Airman

Gallery

49th Royal Tank Regiment Matilda II with swastika and Iron Cross markings to denote opposing force status during a 1941 exercise in Dover.
Dutch soldiers of 11 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 Desert Disruptive Pattern Material (DPM) in a temperate environment.
Scene from a simulated Royal Marines beach landing during the 2009 Bournemouth 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 wear Tropentarn uniforms and soft hats while the assaulting "blue force" Marines would be wearing MTP uniforms with Mk 7 helmets.
A sniper from the French CENZUB opposing force wearing a blue-and-gray version of Camouflage Central-Europe.
51st Fighter Wing airman denoting opposing force status by wearing his Battle Dress Uniform back to front (note the contrast of the uniform with the individual 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 former Soviet MT-LB vehicle as part of the OPFOR during an exercise
Michigan National Guard OPFOR wearing tiger stripe camouflage uniform and carrying a simulated RPG-7.
OPFOR rank insignia mimicking the Soviet style (used during the Cold War)
T-72M1 used by the 3rd Amphibious Assault Battalion, 1st Marine Division of US Marines at Camp Pendleton during Kernel Blitz 1997 exercise