Unexplained losses?

[Volcano Man]

Are you referring to vehicle type units? If so, when you move them you may incur losses due to breakdowns. Vehicle breakdown losses depend on a PDT value set by the senario designer and whether or not the unit is flagged as being mechanically unreliable (which put a positive multiplier on the PDT specified breakdown value).

To put it simply, the more you move vehicle units the more of a chance of a breakdown loss and the more you move them (deployed) through built up terrain such as forests and cities then the high chance you will have a breakdown (and rightly so).

Hope that helps, but perhaps you are referring to something else?