LONDON, UNITED KINGDOM - MARCH 13: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend 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)
