Foot Guards - are infantry regiments of the Household Division, recognisable by the bearskin worn on their heads. They are responsible for the military security of the sovereign. These are the Coldstream Guards Corps. of Drums from the Massed Bands of the Foot Guards, marching back to Buckingham Palace after 'Trooping the Colour'.
"Beefeaters" - Tower Warders in ceremonial 'Tudor State' dress (their day uniform is 'undress blue'). The 'Ravenmaster' feeds raw meat to the resident ravens at The Tower daily, making them the 'real beefeaters'.