What advice is best for military wife whose husband cheat on
This is confusing because from your post, the husband is the one in military and not the wife.
Also report the husband to their main boss as in the military head where the man is posted, but these was rejected by of her among all the option her reason is that people may side her husband as he is not the first to practice it,
No one can stop someone from cheating. It is left to the wife to divorce, separate or just continue with the relationship if she is benefiting from it.