 From 1 October 1941, the detachment was separated from the regiment, forming Stockholm Anti-Air Regiment ("Stockholms luftvärnsregemente", A 11).On 4 October 1940, a preparedness division from the regiment, the Sundsvall Anti-Aircraft Division ("Sundsvalls luftvärnsdivision", A 10 Su) was detached to Sundsvall.The division was located at Gustav Adolfsskolan on Södra Järnvägsgatan, as well as with staff at Hotel Knaust on Kyrkogatan and in Tingshuset on Storgatan.