Arma 3 is a strategy game developed and published by Bohemia Interactive in 2013. Experience true combat gameplay in a massive military sandbox. Deploying a wide variety of single- and multiplayer content, over 20 vehicles and 40 weapons, and limitless opportunities for content creation, this is the PC’s premier military game. Authentic, diverse, open - Arma 3 sends you to war.
The system requirements are modest, but it's recommended to have a dedicated graphics processing unit for successfully playing Arma 3. GeForce GTX 480 or better GPU is needed.
Most gaming PCs meet the RAM requirement of 8gb, though 4gb is enough to meet the minimum requirements.
Also, note that at least 45gb of hard drive space is required, which is quite big if you plan to install many games.