jjmaster246 1 Posted December 17, 2012 I already own OA as a stand alone, can i just buy arma 2 or do i have to buy CO? Share this post Link to post Share on other sites
garzak36 2 Posted December 17, 2012 You just need to own both games. Share this post Link to post Share on other sites
jblackrupert 308 Posted December 17, 2012 You need to buy Arma 2, install it first then Arrowhead... that becomes "Combined Operations" Share this post Link to post Share on other sites
