Royal Armored Corps cap badge, King's crown

The RAC was created on 4 April 1939, just before World War II started, by combining regiments from the cavalry of the line which had mechanised with the Royal Tank Corps (renamed Royal Tank Regiment). As the war went on and other regular cavalry and Territorial Army Yeomanry units became mechanised, the corps was enlarged.[3] A significant number of infantry battalions also converted to the armoured role as RAC regiments. In addition, the RAC created its own training and support regiments. Finally, in 1944, the RAC absorbed the regiments of the Reconnaissance Corps.