Whilst the white hackle of 2 SCOTS, red hackle of 3 SCOTS and blue hackle of 4 SCOTS have a known ancestry, the origin of 1 SCOTS black hackle and 5 SCOTS green hackle are not clear and have no apparent precedent. It may be that the black hackle of 1 SCOTS simulates the black-cock tail feathers originally worn in the 1904 pattern Kilmarnock Bonnet and latterly in the regimental Glengarry Cap by the Royal Scots and King's Own Scottish Borderers, who merged in August 2006 to form 1 SCOTS. Alternatively, it may be a sympathetic gesture to a former Lowland regiment, the Cameronians (Scottish Rifles), who went into 'suspended animation' in 1968 (and later disbanded), who wore a black hackle in their rifle green dress Balmoral. The adoption of the green hackle now being worn by the Argylls battalion (5 SCOTS) is no doubt a continuation of that regiment's association with the colour green, most prominent in the hue of their regimental kilts and stripes on their regimental association ties. (It is, however, worthy of note that in the 19th Century, all line regiments of the British Army used to designate their "light company" with a green hackle.) The Regimental Band of the Royal Regiment of Scotland does not wear the hackle. However, the Highland Band of the Royal Regiment of Scotland (Territorial Army) continues to wear the red hackle with the Tam o' Shanter. Tradition holds that the black hackle originated as a Scottish tradition of wearing a black feather in your hat to signify you have an ongoing quarrel with someone.