Opened up a few of the stock CoD2 xanims in Tom's XAnim Exporter. I tried doing the animations using the same properties as the g43 animations:

Looping: NO (for all anims this time)
Type: Absolute

I also checked UseBones.

It's still not working, though. Perhaps the problem is in the way I export from .mb to .XANIM_EXPORT?
I would like some input on the steps other modellers/animators go through to export their xanims from Maya to a .XANIM_EXPORT file.