On September 13, 2001, Her Majesty Queen Elizabeth II made history by directing the U.S. National Anthem to be played during the Changing of the Guard, the first time another nation’s anthem had been played during the ceremony. Today, Harriet and I were honored to witness that tribute repeated to mark the 25th anniversary of 9/11. We are deeply grateful to the Royal Family and the British people for standing with the United States in our time of need, and for the enduring friendship between our two nations.