ons ▁being ▁transferred ▁to ▁the ▁Royal ▁Art illery ▁( RA ) ▁as ▁an ▁AA ▁art illery ▁unit ▁on ▁ 1 5 ▁December ▁ 1 9 3 5 , ▁the ▁ 6 0 th ▁( City ▁of ▁London ) ▁AA ▁Brigade , ▁RA ▁( TA ), ▁with ▁H Q ▁and ▁ 1 6 8 th , ▁ 1 6 9 th , ▁and ▁later ▁ 1 9 4 th ▁AA ▁B atter ies ▁re located ▁to ▁Art illery ▁House , ▁B rom ley ▁Road , ▁Cat ford , ▁in ▁South ▁East ▁London . ▁The ▁unit ▁formed ▁part ▁of ▁ 2 7 th ▁( Home ▁Count ies ) ▁Anti - A ircraft ▁Group ▁in ▁ 1 st ▁AA ▁Division . ▁Un like ▁some ▁of ▁the ▁other ▁the ▁units ▁converted ▁to ▁the ▁AA ▁role , ▁the ▁ 4 th ▁Lond ons ▁lost ▁their ▁cap ▁bad ge ▁and ▁adopted ▁the ▁RA ▁bad ge . ▁ ▁In ▁ 1 9 3 9 ▁the ▁RA ▁adopted ▁the ▁design ation ▁' reg iment ' ▁in ▁place ▁of ▁' br ig ade ', ▁and ▁the ▁AA ▁form ations ▁became ▁' br ig ades ' ▁rather ▁than ▁' groups ', ▁thus ▁ 6 0 th ▁( City ▁of ▁London ) ▁AA ▁Regiment ▁formed ▁part ▁of ▁ 2 7 th ▁( Home ▁Count ies ) ▁AA ▁Brigade . ▁ ▁World ▁War ▁II ▁ ▁M obil isation ▁The ▁T A ' s ▁AA ▁units ▁were ▁mobil ised ▁on ▁ 2 3 ▁September ▁ 1 9 3 8 ▁during ▁the ▁Mun ich ▁Cris is ,