Trooping The Colour- Princess Elizabeth inspects the Guards at the Trooping the Colour ceremony. Her tricorne hat, with a white plume fixed into a grenade on the left-hand side, was an exact copy of that of a colonel of the Regiment of 1745. Princess Elizabeth look the salute of the brigade of Guards in her father's place at today's Trooping tie Colour ceremony on Horseguards Parade in honour of the King's birthday. For the first time, as heir tO the throne, she received the traditional honours of a Sovereign. June 7, 1951. (Photo by Daily Mirror).