A (Ayrshire (Earl of Carrick’s Own) Yeomanry) Squadron is the senior Squadron. The Ayrshire Yeomanry have served continuously for over 200 years, and were first raised in 1798.
B (North Irish Horse) Squadron formed as The North of Ireland Imperial Yeomanry in 1902 and in 1908 transferred to the Special Reserve as the North Irish Horse. Placed into suspended animation during the inter-war years, the North Irish Horse was reconstituted in 1939.
C (Fife & Forfar Yeomanry / Scottish Horse) Squadron represents two former regiments which amalgamated in 1956, namely the Fife & Forfar Yeomanry and the Scottish Horse. The latter were originally raised in South Africa by Lord Tullibardine, later Duke of Atholl.