Tanoa is the first expansion for Arma 3.

ARMA 3 is an open-world, realism-based, military tactical shooter video game developed and published by Bohemia Interactive. It was released for Microsoft Windows in September 2013, and later announced for OS X and Linux in August 2015. 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 Canton-Protocol Strategic Alliance Treaty (CSAT), led by a resurgent Iranian military with a coalition of other Middle Eastern and Asian nations, such as China.