Annual Trooping the Color held to mark queen 's birthday . Also the most celebrated annual royal event . Queen Elizabeth turned 84 this year . Grenadier Guards , recently in Afghanistan , Troop the color this year .
Annual Trooping the Color held to mark queen 's birthday . Ceremony considered most celebrated annual royal event . Queen Elizabeth turned 84 this year . Grenadier Guards , recently in Afghanistan , trooped the color this year .