Prince Maurits has been appointed today by his cousin King Willem-Alexander as his Aide-de-Camp Extraordinary. The King also appointed Prince Maurits captain-lieutenant of the Dutch Royal Navy.As Aide-de-Camp Extraordinary to the King, Prince Maurits can attend and represent His Majesty at military ceremonies. He can also have on his uniform the monogram of the King.
Prins Maurits benoemd tot adjudant in buitengewone dienst - Het Koninklijk Huis
If I don't mistake, Maurits's fahter Pieter van Vollenhoven is/has been an Aide-de-Camp Extraordinary to Queen Beatrix.