pvre kultvre

The title pretty much says it all. What games do I have to buy to play this mod? Me and friends really liked the mod and we are thinking about buying the game(s). Thanks in advance.

So I only have to buy this game: http://www.amazon.com/Meridian4-40365ned-Operations-ArmA2-Combined/dp/B003UV8RRE/ref=sr_1_1?ie=UTF8&qid=1340389513&sr=8-1&keywords=Arma and install the DayZ mod? Thanks for the information.