The voodoo cards don't have the TnL chip evidently. And Nvidia who helped sponsor America's Army have excluded Voodoo cards from being able to play the game.  "Go figure since they bought out 3dfX a couple years ago, they don't support Voodoo cards anymore"
http://pub43.ezboard.com/fx3dfxfrm2.showMessage?topicID=2787.topic

Its a full version game I got from a demo disk from PCGamer magazine.  (Nov. 2k2 issue)

America's Army does run on a Voodoo5.

The error Message is a fake, because the Launcher of the Game looks for any 3dfx Vendor ID's, and will automatically refuse to run if found. (go figure about NVidia )

There were Hacked Game .exe's circulating around, as well as Instructions how to modify the .exe yourself with a Hex Editor.

After that, the Game reportedly ran "okay" under Win2k, although I never got further than the Menu when using Win9x (and various Drivers of that time).

3D Analyzer might help solve in-game Problems, but the biggest barrier is the artificial/fake error of the Launcher.

Note though, that I believe the Game received a new Engine with one of the latest Patches. So not all I wrote might be still 100% valid, although I stronly believe so. The Engine itself run's fine even on a Voodoo3, as UT2003 shows. I just don't know if America's Army uses the same version of the Engine.

I just re-read some of the old Stuff I remembered.

The File in Question is the d3ddrv.dll, that needed to be modified. (it was based on the Build 929 Engine, if I'm not mistaken). 2 Bytes need to be modifed, that's it.

Here's what I recovered :

( )

That .dll is a modified one. It was made for the UT2003 Leak, but it should be the very same Engine Build 929, that it targets.

I'm still looking for the Instructions, and will post them when found.

--------- edit ----------
Okay, here's the Instructions :

Hex edit the d3ddrv.dll :

Find '1A12' in hex and change it 'DE10' or anything you like....

After that, the Anti-3dfx Check is bypassed. Any errors you're getting from now on, are true errors, Engine related, and can be tackled.

Best results were yielded with Win2k Drivers, as said...
Win9x Drivers seemed to have more significant problems at that time.

But with the vast increase of good 3rd Party Drivers (e.g. TDHQ, NuAngel and AmigaMerlin), it might be easier than before. Anything that did run the old UT2003 Leak, was able to do the same with the initial Release of America's Army as well.

That is awesome Falconfly..
No problem on the redistribution issue.  You got it.. !
This is great..   Will I'll copy the post and go into the lab and let you know..
I appreciate you taking the time.. 

Tim...