As a result of this, the brigade's three light horse regiments – the 6th, 7th and 14th – were converted into motor regiments; each regiment was authorised to operate 14 scout cars and 44 Universal carriers. It also possessed a single armoured regiment: the 3rd. They continued their previously assigned defensive role on the south coast of New South Wales. The brigade was assigned to the 1st Australian Motor Division on formation and did not see any active service. In May 1942, the brigade was converted again, this time becoming the 3rd Army Tank Brigade. When it was converted to an armoured role, one the brigade's motor regiments – the 14th – was disbanded while the 6th and 7th transferred to the 2nd Motor Brigade. The 3rd Armoured Regiment was converted into the 3rd Army Tank Battalion, and joined two other such battalions, which were formed to provide close support to infantry in combat. The 3rd Army Tank Brigade moved to Largs, and the brigade's positions on the southern New South Wales coast were re-assigned to the 2nd Infantry Division. The following units served with the brigade as a cavalry formation during the war:  The following units served with the brigade as a motorised formation during the war: