▁to ▁Major ▁General ) ▁Josef ▁K amm h uber ▁and ▁was ▁organ ised ▁in ▁the ▁so - called ▁K amm h uber ▁Line . ▁Con cept ually , ▁the ▁system ▁was ▁based ▁on ▁a ▁combination ▁of ▁ground - based ▁rad ar ▁stations , ▁search ▁lights ▁and ▁a ▁J äger le ito ff iz ier ▁( fig h ter ▁pilot ▁control ▁officer ). ▁The ▁J äger le ito ff iz ier ▁had ▁to ▁vector ▁the ▁air bor ne ▁night ▁f ighter ▁by ▁means ▁of ▁radio ▁communication ▁to ▁a ▁point ▁of ▁visual ▁inter ception ▁of ▁the ▁ill umin ated ▁bom ber . ▁These ▁inter ception ▁tact ics ▁were ▁referred ▁to ▁as ▁the ▁H imm el b ett ▁( can opy ▁bed ) ▁procedure . ▁ ▁On ▁ 1 5 ▁January ▁ 1 9 4 2 , ▁II ./ N J G   1 ▁transferred ▁to ▁Sint - T ru iden — Saint - Tr ond ▁in ▁the ▁French ▁pron unci ation — in ▁Belg ium . ▁Sch n au fer ▁entered ▁front - line ▁service ▁at ▁a ▁time ▁when ▁the ▁R AF ▁was ▁re ass ess ing ▁the ▁air ▁off ensive ▁against ▁Germany . ▁The ▁effect iveness ▁of ▁British ▁Bom ber ▁Command ▁to ▁accur ately ▁hit ▁German ▁targets ▁had ▁been ▁question ed ▁by ▁the ▁War ▁Cab inet ▁Secretary ▁David ▁B ensus an - Butt ▁who ▁published ▁the ▁But t ▁Report ▁in ▁August ▁ 1 9 4 1 . ▁The ▁report ▁in ▁parts ▁concluded ▁that ▁the ▁British ▁cre ws ▁failed ▁to ▁navigate ▁to , ▁identify ,