I agree with John and don't believe your H's chain of command approves of having OW stay at his place. If she's on active duty, she should be drawing BAH and having her own place. And if not, why isn't she in the dorms????
Unless of course this wench is in dire financial situation that she needs to save all the money she can (to pay creditors, for example)...
Did your H ever tell you the reason why OW is staying with him?