In a ceremony north of London at the Royal Air Force College at Cranwell - called the first military air academy in the world and celebrating its 90th anniversary this week - the RAF's newest cadre of pilots received their wings.
Prince William had been learning to fly for four months at Cranwell. Senior officers guided him through a custom-tailored, shortened version of a flight training program that takes normal Air Force enlistees as long as four years to complete.
William's own father, Prince Charles, who earned his wings at Cranwell 37 years ago, pinned the badge onto his son's chest in the Friday ceremony.
Prince William, third in line to the English throne, has another few weeks of training with the RAF before he switches hats once more, for a stint in the Royal Navy.