Hi. I'm thinking about buying operation arrowhead, and I have some questions: 1 - With ARMA 2 Free, I will be able to run dayz right? Will I have any trouble with that? 2- Can I play all of the mods with operation arrowhead? Takistan life, 1944 etc.? 3 - Is there substantial difference between having the Combat Operations and the ARMA 2 free + operation arrowhead aside from the fact that I will not have the single player for ARMA 2?