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Britain's Prince William, The Duke of Cambridge poses by an air ambulance he begins his new job with the East Anglian Air Ambulance (EAAA) at Cambridge Airport on July 13, 2015. The former RAF search and rescue helicopter pilot will work as a co-pilot transporting patients to hospital from emergencies ranging from road accidents to heart attacks. AFP PHOTO / POOL / Stefan Rousseau (Photo credit should read STEFAN ROUSSEAU/AFP/Getty Images)

Britain's Prince William, The Duke of Cambridge poses by an air ambulance he begins his new job with the East Anglian Air Ambulance (EAAA) at Cambridge Airport on July 13, 2015. The former RAF search and rescue helicopter pilot will work as a co-pilot transporting patients to hospital from emergencies ranging from road accidents to heart attacks. 
AFP PHOTO /  POOL / Stefan Rousseau        (Photo credit should read STEFAN ROUSSEAU/AFP/Getty Images)