Powered by the award-winning Unreal engine, TacticalOps: Assault on Terror throws you into the life-and-death world of counterterrorism. Join the Special Forces or the Terrorists in a subversive battle of good versus evil. The side you choose is up to you. In the end, only one can triumph.
This is the Tactical OPS mutator pack, in the case of the muties in the XMas pack doesn't work, you may try this one, also it adds some game mods to the UT version only