Corps covering the South (1, 5, 6, 8 and 9 AA Divisions) corresponding with 10 and 11 Groups RAF II Anti-Aircraft Corps covering the Midlands (2, 4, 10 and 11 AA Divisions) corresponding with 9 and 12 Groups RAF III Anti-Aircraft Corps covering the North (3, 7 and 12 AA Divisions, and OSDEF) corresponding with 13 and 14 Groups RAF Groups In October 1942, the corps and divisions were abolished and replaced by seven flexible AA Groups more closely aligned with the operational structure of Fighter Command: 1st Anti-Aircraft Group covering London 2nd Anti-Aircraft Group covering the Solent, South-East England and southern East Anglia (1st and 2nd AA Groups coincided with No. 11 Group RAF) 3rd Anti-Aircraft Group covering South-West England and South Wales (coinciding with No. 10 Group RAF) 4th Anti-Aircraft Group covering North Wales and North-West England (coinciding with No. 9 Group RAF) 5th Anti-Aircraft Group covering northern East Anglia and the East Coast as far as Scarborough, North Yorkshire (coinciding with No. 12 Group RAF) 6th Anti-Aircraft Group covering North-East England and Scotland (coinciding with No. 13 Group RAF (except Northern Ireland) and No. 14 Group RAF) 7th Anti-Aircraft Group covering Northern Ireland the Orkney and Shetland Defences remained separate Later events Later, the 6th AA Group took over the Solent area to cover the preparations for Operation Overlord and was replaced in NE England by a new 8th Anti-Aircraft Group. A new 9th Anti-Aircraft Group was formed to cover southern East Anglia during the flying bomb offensive (Operation Diver). On 1 April 1943, AA Command took over control of smoke screens from the Ministry of Home Security. These installations were manned by the Pioneer Corps. In November 1944, the 3rd, 4th and 7th Anti-Aircraft Groups were disbanded, with the areas covered by the 2nd and 5th Anti-Aircraft Groups extended. Postwar When the TA was reformed after the Second World War in 1947, AA Command was generously provided for, with a large number of units, some of them including members of the Women's Royal Army Corps (successors of the ATS). It was structured in five regional AA Groups, each commanding a number of TA and Regular AA Brigades: 1st AA Group – London 2nd AA Group – Aldershot 3rd AA Group – Edinburgh 4th AA Group – Warrington 5th AA Group – Nottingham On 1 December 1954, it was announced that AA Command would be disbanded with