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Detachment One is a North America based Arma 3 unit based on MCSOCOM Detachment One.  We are extending an invitation to skilled personnel interested in running operations of the following types:

  • Direct Action
  • Special Reconnaissance
  • Special Activities

The atmosphere at DetOne is more relaxed, as we have all been a part of previous milsim units. No need to report in, finish statements with “Sir!” nor address members by rank.
We have a Teamspeak 3 and Arma 3 server and primarily use TS3 and Discord for communications.



  • The main operation takes place on Saturdays at 9PM EST
  • Other events and training may take place weekly or as determined.
  • Our servers are online 24/7 with the exception of maintenance, so our members can additionally gather/play at any time.




  • Minimum age of 18
  • Teamspeak 3 with Microphone
  • Fluent in English
  • Arma 3 installed
  • Good overall fit for the unit


Open Roles:

  • Direct Action Element Member
  • SARC – Special Amphibious Reconnaissance Corpsman
  • Aviator, 1-160th SOAR

The unit also has a “Fires Element,” where members can serve roles of:

  • Machine Gunner
  • Infantry Assaultman
  • Mortarman

Candidates will undergo an Initial Skills Assessment covering the followin criteria before acceptance:

  • Land Navigation
  • Radio Communication/TFAR
  • ACE Advanced Medical Skills
  • Room Clearing/CQB and POS ID
  • ACE Explosives


Further skills on the individual and team level may be trained and developed after entrance.

To join or if you have questions, please message one of these members:


Join us on Discord!


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