What could I be liable for (military lawsuit)?

No.  Compensatory damages in a civil lawsuit are for the purpose of "making the injured person whole," not providing a windfall.  Damages for lost wages that weren't lost, or for medical expenses that weren't paid, should not happen.  Depending on the circumstances, though, you might be liable for pain and suffering.

If the other person's injuries damage or end his military career, that could be the basis of a claim for long-term wage loss.  Typically, this would have to be proved by expert testimony by a vocational economist or similar professional.