I'm not sure how you are refusing to improperly service something, The contractor is there because a high ranking individual at the DOD put them there, in most cases they are helpful, and willing to help out when they can, but they are there with the orders to make sure the equipment they are tasked is maintained properly.

With that said, if a commander orders someone under his command to smash the piece of equipment with a hammer, the contract won't interfere, but he will report the situation.

The issue is, most of the equipment at this point is well beyond the knowledge a company commander would have, they aren't qualified to know if this is something that can be fixed in the field, and a soldier under his command that is qualified isn't in a position to refuse the capt. order. So they fry the equipment.

The army is pretty big on redundancy, and having contingencies, it would be very rare that an operation couldn't continue without a single piece of equipment. It might be harder, and may be a greater risk, but in a place where lots of things get shot, you make a plan, then you make due.

I'm not saying the scenarios I'm describing fit all situations, but I can say that far less equipment was destroyed after they came on board.