Aide-de-camp

An aide-de-camp ( or ; French expression meaning literally helper in the [military] camp) is a personal assistant or secretary to a person of high rank, usually a senior military, police or government officer, a member of a royal family, or a head of state. This is not to be confused with an adjutant, who is the senior administrator of a military unit. The first aide-de-camp is typically the foremost personal aide.