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CAMBRIDGE, ENGLAND - JULY 27: Prince William, Duke of Cambridge (C) is seen in the briefing room with the crew as starts his final shift with the East Anglian Air Ambulance based out of Marshall Airport on July 27, 2017 near Cambridge, England. (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)

CAMBRIDGE, ENGLAND - JULY 27: Prince William, Duke of Cambridge (C) is seen in the briefing room with the crew as starts his final shift with the East Anglian Air Ambulance based out of Marshall Airport on July 27, 2017 near Cambridge, England.  (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)