I'm sorry to hear you are having troubles. I'm not sure what advise to give you. Trixie was crate/kennel trained, so I never dealt with potty pads (which I am regretting on those nights when I take her out on below zero temperatures

) I guess I would say, keep sticking to it. Praise him when he does go on the pad. When you catch him in the act, tell him 'no' and carry him to the pad. I think eventually he'll remember.
I hope you are doing well with your husbands deployment. I know what that's like