There are no regulatory requirements. Usually there is no need for a third party to be present. If you are conducting monthly counseling sessions and all of your Soldiers are counseled one-on-one with the exception of the female who is counseled with a third party it will most likely create an issue. Why are you treating her differently? Has she done anything or acted in a way that warrants you bringing in a third party? She will most likely feel that you do not trust her which will negatively impact the morale of your team. Let’s look at this in reverse: How would you feel if you were the sole man in an otherwise all-female team and your supervisor brought in another female every time she counseled you?