Soldiers direct guests to their seats to watch the traditional Trooping the Color in London on Saturday, June 11. The Queen continues to celebrate her 90th birthday with the display of more than 1,400 officers and men in their famous red jackets and black bearskin hats, with 200 horses and more than 400 musicians. OLI SCARFF/AFP/Getty Images Members of The Foot Guards and The Household Cavalry march. The monarch is technically the head of Britain's armed forces, and would traditionally lead an army into war. The parade gives the Queen a chance to review and approve her army. OLI SCARFF/AFP/Getty Images
Queen Elizabeth II and Prince Philip, the Duke of Edinburgh, ride in an open carriage as they inspect the troops. Ben A. Pruchnie/Getty Images Europe/Getty Images
A soldier looks out of an upper floor window to watch the parade. OLI SCARFF/AFP/Getty Images
Queen Elizabeth II inspects the soldiers. OLI SCARFF/AFP/Getty Images
Members of Number 7 Company Coldstream Guards look their best during the parade. OLI SCARFF/AFP/Getty Images
From left to right: Anne, Princess Royal; Camilla, Duchess of Cornwall; Charles, Prince of Wales; Catherine, Duchess of Cambridge, Princess Charlotte of Cambridge; Prince George of Cambridge; Prince William, Duke of Cambridge; Prince Harry, Queen Elizabeth II and Prince Philip, Duke of Edinburgh, gather on a balcony to watch the events. Ben A. Pruchnie/Getty Images
Catherine, Duchess of Cambridge, holds her daughter Princess Charlotte as Prince William, Duke of Cambridge, leads their son Prince George away from the balcony after watching a flypast of aircraft by the Royal Air Force. JUSTIN TALLIS/AFP/Getty Images