It's free, so where's the contest? I doubt any of the two companies paid attention as to when the other title is released.
It was more of a joke, but considering AA is considered a fairly realistic tactical shooter as well, it could draw people away from ArmA 2 (especially after the German reviews about bugs etc).
And ofcourse since it's free, more people might be inclined to do so.
Makes me wonder though, is this still being co-developed by the American military?
Must be funny for them making a fairly realistic game while ignoring it themselves and using another program and help train themselves with.
You'd think they would use the game they are helping to develop.