No... no it shouldn't. It's just a glaring "What?" moment and prime snark bait. If your units are horribly outteched by the other side it makes perfect sense for you to be losing, badly. This is why antiaircraft weapons exist - you have to make them or make units with that capacity or accept the fact that you're going to get Death From Above. This is why research is important. And once again. Supplies makes no sense. If it's fuel, then why doesn't the tank loose health for being outside of friendly territory, or on the other side of the planet? Why is it that the tank apperently only uses its engine in battle? If it's ammo, why do enemy ranged attacks do a minimum of 1 damage? An archer should not even be able to scratch a tank; the tank doesn't seem to be shooting back. In addition, usually vehicles (like bombers, for instance) don't explode when they run out of ammo. Health is not the same thing as supplies. Supplies would be an interesting independant addition, it shouldn't be the same as the health bar. It's an arbitrary penalty that should be removed, and was probably due to a rounding error (damage calc rounds up even infinitessimal decimals to 1) in the first place..