They are lost to keep things simple and easy to calculate.
This just made attrition outside of combat a whole lot more interesting with what you do with your divisions.
BTW, will the AI have to be micro managed say if I ask them to redeploy somewhere and the AI decides to go right into a swamp and lose vehicles or will it take the least attrition-able way to redeploy somewhere?
Edit: Also, will they gain experience from losing vehicles left and right if they're being deployed from one place to another and not actually in combat?
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