ArmA 2 Free - E3 2011 Launch Trailer (Game)

In June 2011 Bohemia Interactive announced that a free to play version of ARMA 2 would be released, featuring full multiplayer compatibility with the retail version of ARMA 2. However the singleplayer campaign has been omitted and players will not be able to use HD textures, mods or play with Operation Arrowhead or DLC content. Essentially it serves as a "Lite" version of the game.

text source: wikipedia.org