The problem with the once a month starts is that it eventually depletes the batteries. As well, if not run until operating temperature it can result in contamination of the oil.
When I was attached to army units, the infantry or artillery would theoretically start their vehicles once a week for stables parade. Understand that these are diesel vehicles, some with no additional source of heat. They could spend the better part of the day boosting and then running the vehicle for a half hour, then shutting it down at 3PM. There was no way the batteries were going to recharge, especially when they were at -15 to -35°C. Then we had the special soldiers who would crank the 5 ton until either the truck started or the solder would fly out of the starter windings. We mechanics would prefer if those guys just left them alone.
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