Crews

[PoorOldSpike]

The instant they bail out of a tank or abandon their gun or whatever, their ammo reads 'Low' or '0' even though they haven't fired a shot.
Thats because they only have a few shots in the chamber.
Incidentally even when it reads '0' they'll still fire forever (as will all infantry units) but usually only when the enemy are close.
As the manual says - "infantry units never run out of ammo and will always fire in self-defense"