What is OPFOR and why is it among the most fun and valuable things to do in the military?

I had the most fun in the Marine Corps when I had the opportunity to function as OPFOR. To borrow a quote from Fury, it was the best job I ever had. OPFOR stands for Opposing Forces, and it means pretending to be the enemy in training scenarios and exercises.

Sometimes actors are hired to be the OPFOR: I remember fighting against OPFOR that were from Afghanistan and bringing with them a sense of realism and cultural knowledge. Other times it’s just designated Marines. I loved being that Marine and is one of the best ways to spend a field exercise.

Obviously, villains have more fun, but as OPFOR, you get to be creative. You are not subject to the warfighting methods of the United States Marine Corps, and they encourage you not to fight like a Marine, but like a guerilla.

This allows for a different level of freedom. Since your force will be predictably outgunned by the Marines you’re fighting, you’ll die a glorious death. When you notionally get taken off the board, there is no squad leader to yell at you for making a tactical mistake. You can freely experiment, and it’s okay when it doesn’t work out.

Plus, every time I played OPFOR, I didn’t have to wear my plate carrier and helmet. This makes you surprisingly nimble and subtracts the weight and heat both of those items bring.

The value of OPFOR

OPFOR is a valuable experience for a military unit. The Marine Corps might just assign one platoon or one squad to be OPFOR, but the Army has entire units designated as OPFOR. (The Army’s 1st Bn 509th Infantry Regiment is famous for acting as OPFOR at the Joint Readiness Training Center in Fort Polk.)

Having to face off against actors can create realistic cultural expectations and experiences. However, using trained Soldiers or Marines creates a very fierce fighting experience as when trained warfighters square off against their peers you get intense and unpredictable situations.

Steel sharpens steel, and that is how OPFOR works. If you are deploying to go fight overseas, having something akin to that experience before deployment can be invaluable.

My favorite Opposing Forces experience

Philippine Marine Sgt. Mark Sibbaluca, center, and Staff Sgt. Limuel E. Pigon, left, practice maneuvering techniques alongside U.S. Marines with Battalion Landing Team 2/5, 31st Marine Expeditionary Unit, in Claveria, Philippines, Oct. 3, 2022. The bilateral training was conducted as part of KAMANDAG 6 to share tactics, techniques and procedures. KAMANDAG is an annual bilateral exercise between the Armed Forces of the Philippines and U.S. military designed to strengthen interoperability, capabilities, trust, and cooperation built over decades shared experiences. (U.S. Marine Corps photo by Staff Sgt. Danny Gonzalez)

It was Romania in 2011. We had over a week on the ground on the coast of the Black Sea. We cross-trained in a variety of small unit tactics with the Romanian military and this all led up to a major exercise that was a joint landing between Romanian and American forces.

My weapons platoon, minus the assaultmen, was left behind to play as OPFOR for the landing. As our opponents sailed off to the ship to spend the night and launch in the morning, we began planning. We were going to be a group of insurgents, so we dug our way into the training area, taking a compound and readying it for an assault.

We set up a defense that relied on us being on a constant bounding retreat, causing the attacking forces to follow us. This allowed us to set ambushes and delaying tactics along the way.

Our final fighting position was going to be in a dilapidated old building. The building looked to be a big cafeteria with one main room and a kitchen in the back. The serving window was huge and led directly into the big main room and we used a huge piece of wood to block that window.

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Contractors from Diplomatic Protection Training Institute provide an opposition force for the 48th Infantry Brigade Combat Team during training at Camp Shelby Joint Forces Training Center. The contractors are an Ohio-based, veteran-owned small business, providing reality-based training and consulting that blends protection principles and high-threat protection doctrine. (Photo by Capt. Michael Thompson/48th Infantry Brigade Combat Team)

Our plan worked like a charm. While we lost men along the way and the Romanian and U.S. Marine Corps forces moved inwards, we were successful in getting them to follow us. (One thing you can always count on is the aggression of the U.S. Marines.)

We drew them in, and when they reached our final fighting spot, we gave them hell. We fought from the windows, and when they breached the building, our men hid behind pillars. We made them earn every inch. We drew them into what was essentially a perfect defilade position.

At the end, it was down to me and one other guy. You see, we had an M140 machine gun hidden behind the service window with the wall in front of us. My partner and I watched as our opponents piled in and fought our guerrilla force. Once they were deep in that big open room, we pushed that piece of wood down, revealing the service window, and I let loose with a huge burst from my remaining blanks. In real life, they would have had a mass casualty event and this was brought up during the after-action report.

Our time as OPFOR made everyone realize that aggression is great, but planning is better. OPFOR isn’t just fun; it’s valuable.

OPFOR is not only a break from the tactical considerations of being a Marine, but it’s educational. When you spend a ton of time planning how to fight Marines, you learn how to fight Marines. That knowledge allows you to see how you’ll be fighting from the other side and to see inside the minds of the bad guys. It’s much easier to defeat an enemy when you can think like the enemy.

That’s the hidden value of OPFOR and why everyone should get an opportunity to role-play as OPFOR, from privates who serve as point men to platoon commanders.

Editor’s Note: This article was originally published in August 2023. It has been edited for republication.

Feature Image: U.S. Marine Corps MV-22 Ospreys from Marine Corp Base Hawaii, air inserts 2nd Battalion, 35th Infantry Regiment, 3rd Infantry Brigade Combat Team, 25th Infantry Division opposing forces on Pohakuloa Training Grounds, Hawaii, Nov. 7, 2022. Bilateral and multilateral exercises strengthen relationships and enhance interoperability with allies and partners through shared experiences and tough, realistic training. We routinely invite and encourage allies and partners to participate in JPMRC rotations. (U.S. Army photo by Sgt. Daniel Proper, 25th Infantry Division)

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