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LONDON, UNITED KINGDOM - MARCH 13: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II and Prince Philip, Duke of Edinburgh hold hands as they leave a Service of Commemoration to mark the end of combat operations in Afghanistan at St Paul's Cathedral on March 13, 2015 in London, England. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - MARCH 13: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II and Prince Philip, Duke of Edinburgh hold hands as they leave a Service of Commemoration to mark the end of combat operations in Afghanistan at St Paul's Cathedral on March 13, 2015 in London, England. (Photo by Max Mumby/Indigo/Getty Images)