Oh I'm sorry, OP, for you and your husband because it seems like he is having a mental health crisis.
Please pay attention to the posts here: as much as you care for him, his behaviour at the moment is very dangerous, directed towards you and the home environment, and is likely to escalate to physical violence.
Find out as much as you can about what support is available from the army if you haven't already. Is there a former colleague of his, someone military who might understand and who he might respect, that you can reach out to to explain the situation? Someone who might be able to help him directly? Clearly he doesn't want to hear the urgency of the situation from you, so that might be a route to take to get him support.
BUT, and this is so important, you must prioritise your safety and that of your child first. Support him as best you can, but you have to remove either yourself (and your baby), or him from your home. I know that sounds dramatic, but from what you've written he sounds very much on a knife-edge, and as the volatility has been going on a while and is now escalating in frequency, I would not be taking the risk. If he finally crosses the line and hurts you, it's all over for your family life, so act now to prevent it while you still can. Is there somewhere you and baby can stay for a bit? I would go asap, and then call him to explain clearly that you won't be coming back unless he agrees to get help AND you see evidence that he's doing it and it's working. Tell him it's because you love him that you're doing this. It might be the wake-up call he needs. You can keep supporting him, just from a safe distance. Either that, or I would line up somewhere safe for him to go, and change the locks on him. Are his parents about? Would it be a good idea to involve them? It seems like you've done all you can on your own, OP, so now is the time to change your approach.
You have a child to think about, and this kind of volatility in the house is a major NO-NO. Even if you're convinced he would never hurt your daughter, Social Services won't be.
Best of luck, OP.