Scottish Infantry have different rules for the Tamo'shanter with the cap badge worn on the left side of the head. Other adornments Some regiments and corps wear a coloured backing behind the cap badge. These include: Foot Guards: blue-red-blue patch (less the officers of the Scots Guards, who wear a patch of Royal Stewart tartan) Honourable Artillery Company: black circle Princess of Wales's Royal Regiment: blue-yellow-blue patch Royal Anglian Regiment: small black 'tombstone' Queen Alexandra's Royal Army Nursing Corps: red patch Royal Army Medical Corps: dull cherry oval patch Army Air Corps: black patch Army Physical Training Corps: patch in corps colours Royal Marines: 'red tombstone' (only on dark blue beret worn by those who are not commando-qualified including Royal Marines Cadets) Royal Welsh Regiment and Mercian Regiment: green badge outline and square respectively Queen's Royal Lancers: red patch Household Cavalry: blue-red-blue patch The Royal Dragoon Guards: red diamond patch Yorkshire Regiment: Brunswick (British racing) green Royal Scots Dragoon Guards: black patch (Worn in mourning for Emperor Nicholas II of Russia, who was their colonel-in-chief at the time of his murder King's Royal Hussars: red patch Royal Wessex Yeomanry: black patch behind the cap badge. Royal Gibraltar Regiment: red-grey-red patch Royal Regiment of Fusiliers: feather hackle on the beret. Other ranks of the Royal Welsh also wear hackles. Members of the Royal Tank Regiment, 4/73 (Sphinx) Special OP Battery Royal Artillery, Royal Regiment of Fusiliers, Army Air Corps, Parachute Regiment, SAS and Intelligence Corps wear berets in Nos 1, 2, 3 and 6, Dress. Other English and Welsh Regiments and Corps wear peaked caps in these orders of dress. Troops from other services, regiments or corps on attachment to units with distinctive coloured berets often wear those berets (with their own cap badge). Colonels, brigadiers and generals usually continue to wear the beret of the regiment or corps to which they used to belong with the cap badge distinctive to their rank. Old units Former regiments and corps, now amalgamated: Dark Blue - Queens Regiment, Royal Hampshire Regiment Khaki — Green Howards, King's Own Royal Border Regiment, Prince of Wales's Own Regiment of Yorkshire, Duke of Wellington's Regiment, Reconnaissance Corps, infantry motor battalions in World War II Dark (Rifle) green — Light Infantry, Royal Green Jackets, Devonshire and Dorset Light Infantry, Royal Gloucestershire, Berkshire and Wiltshire Light Infantry, Rifle Brigade, King's Royal Rifle Corps, 2nd King Edward VII's Own Gurkha