Prince William's eldest son and heir, Prince George, has several years ahead of him before he commits himself to being a full-time working royal.
According to a royal historian, it is considered a "rite of passage" for Royal Family members to spend time with the British Armed Forces before dedicating themselves to public life.
Both his father and Prince Harry spent several years with the Army and were able to attend university before becoming senior royals.
When asked about George's future responsibilities, historian and commentator Ed Owens said: "Let's look at the example of William and Harry, it was post-university, post-military service.
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