LONDON, ENGLAND - NOVEMBER 10: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge arrive to a reception in aid of the National Memorial Arboretum Appeal at St James's Palace on November 10, 2011 in London, England. The Appeal was launched in April 2009 by its Patron, The Duke of Cambridge, to develop the Arboretum into a world-renowned centre for Remembrance and to ensure that there are necessary facilities for the 300,000 visiting families, servicemen and women, veterans and members of the public each year (Photo by Lefteris Pitarakis - WPA Pool/Getty Images)