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LONDON, ENGLAND - SEPTEMBER 11: Prince William, Duke of Cambridge and Prince Harry attend a Drumhead Service before the athletics at The Invictus Games on September 11, 2014 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

LONDON, ENGLAND - SEPTEMBER 11:  Prince William, Duke of Cambridge and Prince Harry attend a Drumhead Service before the athletics at The Invictus Games on September 11, 2014 in London, England.  (Photo by Mark Cuthbert/UK Press via Getty Images)