In 1944 the regiment was assigned to 21st Army Group preparing for the Normandy Campaign. In the event, the regiment did not take part. However, by the autumn of 1944, the German "Luftwaffe" was suffering from such shortages of pilots, aircraft and fuel that serious aerial attacks on the UK could be discounted. At the same time 21st Army Group was experiencing a severe manpower shortage, particularly among the infantry. The War Office began to reorganise surplus AA regiments in the UK into infantry units, primarily for duties in the rear areas, thereby releasing trained infantry for frontline service. On 1 October 1944, 43rd S/L Rgt was converted into 43rd (5th Bn Duke of Wellingtons) Garrison Regiment, RA. A month later, it was reorganised as an infantry battalion and redesignated 600th Regiment RA (5th Bn Duke of Wellingtons). It was the first such RA infantry regiment formed, and was sent to join Second Army in NW Europe for line of communication duties. The unit was placed in 'suspended animation' in February 1945 and its personnel drafted to other units.