I agree that your husband's commanding officer needs to know what is going on. This may anger some people, but I have never been in favor of women in the military because of the many distractions that it brings. The military needs to know that this will continue to happen and they need to help their soldiers develop character and discipline.
I'm so sorry for your pain. And I'm sorry your husband did not have the maturity to resist his urges. Once the intensity of your pain subsides a little and you can think clearly, ask yourself if you think your husband will be able to be a man again. Has he shown signs of maturity or has he always acted like a little boy. If he has usually acted like a grown man, and agrees to make your marriage work, then you have a shot. Many have made it through, but it takes hard work, commitment and a lot of support. If you think your husband has mostly been immature his whole life, then it would not be worth all of your hard efforts.
It's easy to blame the Army as your pain is great. But it was your husband and the lady who made the choices they did. There are two kinds of people: the ones who have decided in their mind that they would never, under any circumstances cheat, and those that have never really given it any thought and when the opportunity arises, they make the decision at that time. Maybe the Army will start teaching their soldiers that they have to have the first mindset when it comes to their family. You know they stress that mindset when it comes to their country.
I'll be praying for you. There are a lot of us out here that care about you and would do whatever we could to help you through.