▁By ▁early ▁ 1 9 4 3 ▁it ▁had ▁become ▁a ▁mobile ▁unit ▁once ▁more ▁as ▁part ▁of ▁the ▁field ▁force ▁under ▁W O ▁control ▁with ▁the ▁following ▁composition : ▁ ▁R H Q ▁ 6 0 ▁H AA ▁R gt ▁▁ 1 6 8 ▁H AA ▁B ty ▁▁ 1 6 9 ▁H AA ▁B ty ▁▁ 2 0 6 ▁H AA ▁B ty ▁▁ 6 0 ▁H AA ▁R gt ▁Work shop , ▁Royal ▁Elect rical ▁and ▁Mechan ical ▁Engine ers ▁( RE ME ) ▁ ▁Norm andy ▁The ▁regiment ▁was ▁assigned ▁to ▁Second ▁Army ▁for ▁the ▁Al lied ▁invasion ▁of ▁Norm andy ▁( Operation ▁Over l ord ). ▁It ▁formed ▁part ▁of ▁ 1 0 6 th ▁AA ▁B de , ▁scheduled ▁to ▁land ▁shortly ▁after ▁D - Day ▁to ▁defend ▁the ▁air fields ▁that ▁would ▁be ▁established ▁for ▁R AF ▁Second ▁T act ical ▁Air ▁Force . ▁ ▁The ▁brig ade ▁began ▁landing ▁on ▁ 1 0 ▁June ▁( D ▁+ ▁ 4 ), ▁although ▁the ▁regiment ▁at ▁first ▁only ▁had ▁two ▁of ▁its ▁batter ies , ▁the ▁third ▁battery ▁not ▁arriv ing ▁until ▁after ▁ 2 5 ▁June . ▁The ▁deployment ▁was ▁fr ustr ating , ▁because ▁Luft wa ffe ▁attacks ▁were ▁l ighter ▁than ▁anticip ated ▁and ▁there ▁were ▁sur plus ▁H AA ▁guns ▁in ▁the ▁beach head . ▁In ▁addition , ▁R AF ▁command ers ▁refused ▁permission ▁to ▁eng age ▁enemy ▁aircraft ▁unless ▁the ▁air fields ▁themselves ▁were ▁being ▁attacked . ▁ ▁Air field ▁defence ▁having