LONDON, ENGLAND - MARCH 13: Prince Philip, Duke of Edinburgh (R) and Queen Elizabeth II depart a Service of Commemoration for troops who were stationed in Afghanistan on March 13, 2015 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - MARCH 13: Prince Philip, Duke of Edinburgh (R) and Queen Elizabeth II depart a Service of Commemoration for troops who were stationed in Afghanistan on March 13, 2015 in London, England. (Photo by Chris Jackson/Getty Images)