The brigades were the same, but by February 1941 their locations and composition had changed:   In the Spring of 1941, The 50th LAA Brigade was split up, keeping the S/L regiments while a new 66th AA Brigade took the HAA guns and rockets:  The division's order of battle thus contained a large number of S/L units. AA Command redeployed its S/L units during the summer of 1941 into 'Indicator Belts' of radar-controlled S/L clusters covering approaches to the RAF's Night-fighter sectors, repeated by similar belts covering AA Command's Gun Defence Areas (GDAs). Inside each belt was a deep 'Killer Belt' of single S/Ls cooperating with night-fighters patrolling defined 'boxes'. The pattern was designed to ensure that raids penetrating deeply towards the Midlands GDAs would cross more than one belt, and the GDAs had more S/Ls at close spacing. The number of LAA units to protect Vital Points such as airfields was growing, albeit slowly. After December 1941 the division's order of battle was as follows:  32nd AA Brigade  40th AA Brigade  41st AA Brigade  50th AA Brigade   'Mixed' indicates that women of the Auxiliary Territorial Service (ATS) were integrated into the unit. The increased sophistication of Operations Rooms and communications was reflected in the growth in support units, which attained the following organisation by May 1942:   The RAOC companies became part of the new Royal Electrical and Mechanical Engineers (REME) during 1942. The 66th AA Brigade HQ, with its signal section and transport company, left AA Command in August 1942 and came under War Office control ready to join First Army in the invasion of North Africa (Operation Torch). The 2nd AA Division, like the other AA Corps and Divisions, was disbanded and replaced on 1 October 1942 by a new AA Group structure. The Midlands and East Anglia were covered by the 5th AA Group, headquartered at Hucknall. The 2nd AA Divisional Signals was apparently converted into the new Group signal unit. The following officers commanded the 2nd AA Division: