How does one volunteer for an Aide-de-Camp position? I think it would a good learning experience.

You don't volunteer. You do a great job at your current assignment and hope to get noticed. Aides are selected by those who they will be aides to, for the most part.

I did not volunteer. I never even thought about it, quite frankly. One day my CO said he had submitted my name and the next thing I knew orders were cut. It was a great experience. I was able to sit in on a lot of meetings I would never have had access to otherwise. Learned a lot.

An officer does not volunteer. FRom what I understand, unit commanders are notified of the requirement for an Aide and which rank is required. Unit commanders then review officer records., and forward their recommendations to the currant Aide to gather several service records for the General Officer to review. After interviews, General Officer makes his choice. The criteria, I have no real knowledge, but I would expect they select on who they think will make flag rank.