132nd (Mixed) Heavy Anti-Aircraft Regiment was an air defence unit of Britain's Royal Artillery formed during World War II.

In April its commander-in-chief, Lieutenant-General Sir Frederick 'Tim' Pile, proposed to overcome this by utilising the women of the Auxiliary Territorial Service (ATS).

The ATS was by law a non-combatant service, but it was decided that Defence Regulations permitted the employment of women in anti-aircraft (AA) roles other than actually firing the guns.

Defences had been planned against this new form of attack (Operation Diver), but the missiles' small size, high speed and awkward height presented a severe problem for AA guns.

After two weeks' experience AA Command carried out a major reorganisation, stripping guns from the London IAZ and other parts of the UK and repositioning them along the South Coast to target V-1s coming in over the English Channel, where the gun-laying radar worked best and where a 'downed' V-1 would cause no damage.

The whole process involved moving hundreds of guns and vehicles and thousands of servicemen and women, but a new 8-gun HAA battery site could be established in 48 hours.

In early August 132nd (M) HAA Rgt came under the command of 102 AA Brigade, which had been scheduled to take part in 'Overlord' but had been diverted to reinforce the 'Diver' defences in South East England.

The guns were constantly in action and the success rate of the HAA batteries against 'Divers' rose progressively until late summer, when the launching sites in Normandy were overrun by 21st Army Group.

Finally there was an inner belt of Observation Posts (OPs), about 20,000 yards (18,000 m) in front of the guns to give visual confirmation that the tracked target was a missile.

Unlike the anti-Diver guns firing over the English Channel or North Sea, VT fuzes could not be employed by the HAA batteries at Brussels because of the risk of casualties to troops and civilians under the missiles' flightpath.