ARMA 3, a unique sandbox-style combat gameplay experience in the most detailed environment of the series to-date.
The XMedSys was designed to fill the giant blank ACE left after ArmA 3 came out but ACE did not. Controling everything works in the same way like in ACE to make a move over as simple as possible (may change in the future) so that everyone who knows ACE should be able to use XMedSys!