[Kevmo]

This kind of service to his country is what makes a 3rd-in-line to the throne a 1st-in-line.

[SuziQ]

Prince William had already served his time in the military. I can’t remember if it was Navy or Army.

[El Gato]

Even their father, Prince Charles,and Uncle, Prince Andrew served in the military. IIRC, Andrew was flying choppers in and around the Falklands during the 1980s unpleasantness with the Argies.

It's an old family tradition you might say.