After its rapid expansion, AA Command was now over-provided with S/L units and under-provided with LAA units, for which suitable guns (the
Bofors 40 mm) were becoming available in quantity. The command began a programme of converting some S/L regiments to the LAA role. One of those chosen was 87th S/L Rgt, which became
128th Light Anti-Aircraft Regiment on 3 March 1942, with 421, 422, 423, 424 LAA Batteries, with 424 LAA Battery under direct
War Office (WO) control.
Mid-War The new regiment initially remained in 53rd LAA Bde, but by early April it had become unbrigaded as it completed retraining. A reorganisation of AA Command in October 1942 saw the AA divisions disbanded and replaced by a smaller number of AA Groups more closely aligned with the groups of
RAF Fighter Command. 11th and 4th AA Divisions merged to form
4 AA Group based at
Preston and cooperating with
No. 9 Group RAF. Shortly afterwards 128th LAA Regiment (with all four of its batteries) transferred to
60th AA Bde in
3 AA Group covering South West England, where LAA guns were urgently required to combat daylight raids by small formations of
Luftwaffe fighter bombers against coastal towns and small ports. These raids continued until mid-1943
Operations Overlord and Diver With the lower threat of attack by the weakened
Luftwaffe, AA Command was forced in early 1944 to release manpower for the planned invasion of Normandy (
Operation Overlord). Many Home Defence AA regiments were reduced, and 128th LAA Regiment lost 424 LAA Battery, which began disbanding at
Torquay, on 17 February 1944, completing by 16 March. In the early part of 1944, 3 AA Group had responsibilities for protecting 'Overlord' camps and embarkation ports, and at the same time preparing for the expected onslaught of
V-1 flying bombs ('Divers'). An elaborate anti-Diver plan was drawn up to protect
Bristol, with belts of LAA guns and S/Ls across the predicted flight path. The V-1 offensive began on 13 June, a week after the 'Overlord' convoys had left harbour and the
D Day landings had begun. In the event, the Bristol defences were not needed: US forces quickly sealed off the launching sites in the
Cherbourg peninsula. The story in the London area was different, and as efforts to combat them (
Operation Diver) progressed, AA units and formations were stripped from the West Country and repositioned along the coast of
South East England. 3 AA Group HQ moved from Bristol to London, and 60th AA Bde was left as a skeleton force. == 628th Infantry Regiment, RA ==