If Britain goes to war, any member of the royal family who is in the armed services is expected to serve alongside his comrades in arms and most or all of them absolutely insist on serving on the front lines if that's where their units are sent. The recently disgraced Prince Andrew served as a naval helicopter pilot during the Falklands war and he was sent on life-endangering missions the same as all the pilots who served alongside him.
During the occupation of Afghanistan, contrary to the extremely insulting comments of the Papaya Paedophile, Prince Harry served as a front line gunner/pilot on attack helicopters.
This is in stark contrast to the utterly cowardly sons of the rich in the USA who suddenly develop fuckin bone spurs when the shit hits the fan, or get shuffled off to the National Guard rather than the front lines!