Arma Reforger Milsim UK | 3CDO British Military Simulation Unit

About 3CDO

3CDO is a British military-inspired Arma Reforger milsim community focused on realism, teamwork, and immersive gameplay.

We train together, deploy together, and operate as a cohesive unit built on discipline and trust.

Whether you're joining for tactical challenges, social interaction, or to be part of a dedicated milsim family, 3CDO offers a space where teamwork and respect are at the heart of everything we do.

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1000+

Over 1000 active members across operations.

Weekly

Weekly training and operations.

£4,592

Raised for charity through events.

3 Years

Operating continuously for over 3 years.

Why Join 3CDO

Authentic British Military Structure

Structured like 3 Commando Brigade with defined ranks, troop organisation, and a clear chain of command.

Tactical Gameplay

Realistic objectives focused on coordination, communication, and proper fireteam manoeuvre at a larger scale.

Community & Brotherhood

A disciplined but welcoming environment where teamwork, respect, and camaraderie come first.

Persistent Campaigns

Operations run over weeks and often months, with player actions shaping future missions and outcomes.

Custom Mods & Loadouts

Authentic British equipment, vehicles, radios, and custom mod packs tailored for realism. Custom maps built for our campaigns.

Weekly Events

Regular training nights, operations, and large scale campaigns scheduled each week. With plenty to do within the community

Application Process

How to Start

Join Discord

First join our Discord server and get started.

ROP (Recruit Orientation Phase)

Complete orientation and familiarize yourself with 3CDO procedures.

Commando 1 (CDO1)

First phase training, learn the basic tactics of how we operate

Commando 2 (CDO2)

Advanced training exercises, and more indepth tactical exercises.

Full Milsim Access

Weapons certifications, qualifications, join larger operations, and experience full milsim life.

ORDER OF BATTLE

Operational units within 3CDO. Each element has a defined battlefield role, command structure, and mission focus.

45Y

Infantry Fighting Unit

45Y our main front line ground combat element responsible for objective seizure, urban clearance, and sustained offensive operations. Capable of deploying up to three full infantry sections.

45W

Weapons & Support

Provides integrated heavy weapons support, including precision fires from sniper teams, indirect fire from mortars, and anti-armour effects from anti tank guided weapons such as Javelin, delivering sustained and responsive fire support to enable manoeuvre elements in offensive and defensive operations.

XRAY

Vehicle Squadron

Armoured and transport vehicle assets, including armoured fighting vehicles and infantry fighting vehicles, delivering decisive firepower, shock effect, protected mobility, and combat sustainment to dominate and defeat enemy forces across the battlespace

CHF

Aviation – Helicopters

Rotary wing aviation assets delivering air assault and rapid troop transport, aerial fires from above, armed overwatch, reconnaissance, casualty evacuation, and close air mobility, integrated with unmanned aerial systems to enhance situational awareness and combat effectiveness in the modern battlespace.

Ground Command

Command and control element coordinating operations, intelligence flow, mission planning, and battlefield decision-making.

24E

Fighting Engineers

Combat engineers specialising in breaching, fortifications, demolition, route clearance, and battlefield engineering tasks.

Recce

Forward reconnaissance and surveillance unit tasked with intelligence gathering, target acquisition, and early warning operations.

Latest Media

Members of 3CDO completing the guns cadre this week. Arma reforger milsim

3CDO Arma Reforger Milsim UK Operation – Having successfully passed Logi 1 training at Bovington Garrison, Royal Marines, Army, and RAF personnel demonstrate their growing proficiency in essential support, coordination, and sustainment tasks within a realistic Arma Reforger milsim environment.

Having successfully passed Logi 1 training at Bovington Garrison, Royal Marines, Army, and RAF personnel demonstrate their growing proficiency in essential support, coordination, and sustainment tasks within a realistic Arma Reforger milsim environment.

3CDO Arma Reforger Milsim UK Operation – Royal Marines, Army, and RAF Commandos arrive at Bovington Garrison to conduct their Logi 1 training. These dedicated troops continue to commit to their personal development, honing essential logistics, coordination, and battlefield support skills within a realistic Arma Reforger milsim environment.

Royal Marines, Army, and RAF Commandos arrive at Bovington Garrison to conduct their Logi 1 training. These dedicated troops continue to commit to their personal development, honing essential logistics, coordination, and battlefield support skills within a realistic Arma Reforger milsim environment.