I thought you might be interested in looking at Do you have to have ARMA II: Combined Operations?.
https://forums.dayz.com/topic/117047-do-you-have-to-have-arma-ii-combined-operations/?do=findComment&comment=1108447
× Pasted as rich text. Restore formatting
Only 75 emoji are allowed.
× Your link has been automatically embedded. Display as a link instead
× Your previous content has been restored. Clear editor
× You cannot paste images directly. Upload or insert images from URL.