This mod adds a remote operated weapon ability to the game. So you can fire a weapon while sitting in the HMMWV.
A good man who goes by the name Fortran80 has released a Beta of the CROWS Weapons System for BF2. This is an add-on file which has to be implemented manually into your BF2 install (no self-installer) so modding experience is required. Good news is that both the Hard Justice and Nations @ War mods are looking into implementing this into their builds, so if you can't mod youself, you'll get your hands on this eventually through their own mods. But if you can't wait till then, here it is...
HMMWV CROWS : FORTRAN 2007
HMMWV Model - Dice
M2 HMG Model - DIce
Crows System / Crows Controls / HMMWV CAP Models - Fortran
CROWS - Common Remotely Operated Weapon Station:
Allows the gunner to operate the turret from the safety of the HMMWV's interior. A custom control panel with LCD tv and joystick,
enables 360 degree horizontal rotation and -20 + +60 degree vertical rotation of the turret.
Crows Control (mounted behind the driver)
360 horizontal + -20/+60 vertical rotation
Custom HUD (immitates viewing the CROWS LCD)
2x/4x/8x/12x Zoom levels
500 Rounds of 50.cal fire power
Feel Free to swing by the BF2/BF2142 section of the BattlefieldSingleplayer forums for indepth info, and to give input, on this great contribution by Fortran80.