BRITAIN-ROYALS-PHILIP

Britain's Prince Philip, Duke of Edinburgh, in his role as Captain General, Royal Marines, attends a Parade to mark the finale of the 1664 Global Challenge on the Buckingham Palace Forecourt in central London on August 2, 2017. - Prince Philip, the 96-year-old husband of Queen Elizabeth II, conducted his final solo public engagement on August 2, 2017, overseeing a military parade in the pouring rain before retiring from a lifetime of service. The Duke of Edinburgh, wearing a raincoat and bowler hat, met members of the Royal Marines and veterans -- many younger than him -- before taking the salute in the forecourt of Buckingham Palace. (Photo by Yui Mok / POOL / AFP) (Photo by YUI MOK/POOL/AFP via Getty Images)