New Arma demo was released today, this demo is made for US gamers and features the many improvements/bug fixes that the developers made to the game in the past few months (its a new version).

Comes with 3 SP missions, 3 MP missions and the best part... a limited version of the editor.

Arma is not a tac shooter "wannabe" or console port and is powered by the same engine used in VBS2, a training tool/sim used by the USMC, ADF, US Special Warfare Center, etc.

Check it out:
http://armed-assault.net/downloads/arma-combat-operations-demo.html

I own the european version and latest patches improved the game in many areas, i might post some screeshots here just for you.