The game works and it is playable. Not totally awesome (frame rates are a little slower than running in BootCamp - and sound is a little jumbled like there's only a few sound channels), but it does run. A big problem is that PunkBuster does not work, so you can only play on servers that do not require PunkBuster (most of them do require it).
1) Install fails. To install, Install on a Windows machine and then copy over the folder to your Mac.
2) edit the ArmyOps.ini file in "America's Army/System/ArmyOps.ini" so that the screen resolution matches your Mac screen resolution. It's on line 125 or so. Remember to use a text editor like the free Text Wrangler or command line with Terminal. Look for "WindowsViewPortX and Y" also look for "FullscreenViewportX and Y". Do not use TextEdit or MS Word. Or you can refer to other postings on this site to resize the screen.
3) Start the game by launching "America's Army/System/ArmyOps.exe"
Have fun.
Todd