▁for ▁the ▁Ch ain ▁Home ▁network ▁of ▁rad ars ▁to ▁defend ▁Great ▁Britain . ▁ ▁By ▁April ▁ 1 9 4 4 , ▁the ▁min istry ' s ▁air ▁Int elligence ▁branch ▁had ▁succeeded ▁in ▁its ▁intelligence ▁efforts ▁regarding ▁" the ▁be ams , ▁the ▁Br une val ▁Ra id , ▁the ▁Gib ral tar ▁bar rage , ▁rad ar , ▁Window , ▁heavy ▁water , ▁and ▁the ▁German ▁night fig h ters " ▁( R . V . ▁Jones ). ▁ ▁Other ▁World ▁War ▁II ▁technology ▁and ▁war fare ▁efforts ▁included ▁the ▁branch ' s ▁V - 1 ▁and ▁V - 2 ▁Int elligence ▁activities . ▁ ▁Ab ol ition ▁In ▁ 1 9 6 4 ▁the ▁Air ▁Ministry ▁merged ▁with ▁the ▁Admir alty ▁and ▁the ▁War ▁Office ▁to ▁form ▁the ▁Ministry ▁of ▁Def ence . ▁ ▁See ▁also ▁Secretary ▁of ▁State ▁for ▁Air ▁ ▁External ▁links ▁Search ▁and ▁download ▁Air ▁Ministry ▁Com bat ▁Re ports , ▁ 1 9 3 9 – 1 9 4 5 ▁from ▁The ▁National ▁Archives . ▁ ▁References ▁ ▁Category : History ▁of ▁the ▁Royal ▁Air ▁Force ▁Category : 1 9 1 8 ▁establish ments ▁in ▁the ▁United ▁Kingdom ▁Category : 1 9 6 4 ▁dis est ab lish ments ▁in ▁the ▁United ▁Kingdom ▁Category : Def unct ▁depart ments ▁of ▁the ▁United ▁Kingdom ▁Government ▁Category : A viation ▁organis ations ▁based ▁in ▁the ▁United ▁Kingdom ▁Category : Min ist ries ▁established ▁in ▁ 1 9 1 8 ▁▁ ▁Category : Un ited ▁Kingdom ▁in ▁World