Britain's Royal Air Force marks centenary with national day of celebrations

Britain's Prince William (3rd L), Duke of Cambridge, and his wife Catherine (2nd L), Duchess of Cambridge, Prince Harry (5th L), Duke of Sussex and his wife Meghan (4th L), Duchess of Sussex, attend a service at Westminster Abbey to mark the 100th anniversary of the Royal Air Force (RAF) in London, Britain on July 10, 2018. (Xinhua/Ray Tang)