ARMA 3 (stylized as ARMA III) is a Czech open world tactical shooter video game developed by Bohemia Interactive for Microsoft Windows. It was released on September 12, 2013. ARMA 3's storyline takes place in the mid-2030s during the fictional Operation Magnitude, a military operation launched by NATO forces fighting in Europe against "Eastern armies" referred to as CSAT (Canton-Protocol Strategic Alliance Treaty) led by a resurgent Iran. Source: Wikipedia, "http://en.wikipedia.org/wiki/ARMA_3," available under the CC-BY-SA License.