Divorce and cheating is high, but it is a sub-culture. If you are on active duty and you deploy with your unit, and all the spouses are living on base, and there is a good family support system in place, then it's not too bad. The older women, married to senior officers and NCOs do a good job of keeping the younger women under control. Where I saw a lot of problems during the stupid @ss war on terrorism, we had a lot of reservists called on active duty, and when women are left on their own, without a support group, cheating and divorces is VERY high. This is what ended my marriage.
It also helps if the woman you are married to was raised in this sub-culture (Her dad was in the military), women that have no experience with long periods of time separated from their men do not deal with it well.
In the USA the number of illegal abortions EXPLODED during WWII, as women were left on their own with millions of men deployed for long periods of time. This isn't talked about much since it was one of those things that happened that authorities turned a blind eye to the practice, much the same way that alcohol was ignored during prohibition, since to do otherwise would create a serious moral problem in military. The US government promoted the mythology that soldiers, sailors, and marines deployed had their loyal women waiting for them as they worked in plants to make military equipment and ammunition for their men. That mythology was so powerful that even today it continues to exist. But if you actually talked to men that for whatever reason, could not serve in WWII, they will tell you stories about all the cheating that happened.