Look at the previous threads discussing the "Medic" class.
Although it works well for Enemy Territory, this is a different game. It would severely reduce the human's dependance on their base, making them disproportionately more powerful if they travel in groups.
It would also greatly increase the amount of spam firing. Who needs to run back to base to reload when you have a Field Ops* giving you ammo.
Yes, though, a V-say system like Enemy Territory (or Tribes, or whatever, you know what I mean) would be tremendously useful.
*In Enemy Territory, the class that hands out ammo