n au fer ▁did ▁not ▁particip ate ▁in ▁the ▁miss ions ▁in ▁defence ▁of ▁C ologne . ▁The ▁H imm el b ett ▁procedure ▁had ▁limitations ▁in ▁the ▁number ▁of ▁aircraft ▁which ▁can ▁be ▁controlled . ▁Therefore , ▁only ▁the ▁most ▁experienced ▁cre ws ▁were ▁deployed , ▁and ▁R ump el hardt ▁and ▁Sch n au fer , ▁who ▁had ▁yet ▁to ▁achieve ▁their ▁first ▁aer ial ▁victory , ▁were ▁left ▁out . ▁Prior ▁to ▁Operation ▁Mill en ni um , ▁Sch n au fer ▁had ▁been ▁appointed ▁Techn ischer ▁Offiz ier ▁( TO — Te chn ical ▁Officer ) ▁on ▁ 1 0 ▁April ▁ 1 9 4 2 ▁and ▁was ▁located ▁at ▁Sint - T ru iden ▁again . ▁As ▁a ▁Techn ical ▁Officer , ▁Sch n au fer ▁was ▁responsible ▁for ▁the ▁super vision ▁of ▁all ▁technical ▁aspects ▁such ▁as ▁routine ▁maintenance , ▁serv icing ▁and ▁modifications ▁of ▁the ▁Gruppe . ▁In ▁this ▁role ▁he ▁was ▁no ▁longer ▁a ▁member ▁of ▁the ▁ 5 . ▁Staff el ▁but ▁was ▁then ▁a ▁member ▁of ▁the ▁St ab ▁( st aff ) ▁of ▁II ./ N J G   1 . ▁ ▁Sch n au fer ▁claimed ▁his ▁first ▁aer ial ▁victory ▁on ▁their ▁th ir teenth ▁combat ▁mission ▁flow n ▁one ▁day ▁after ▁the ▁attack ▁on ▁C ologne ▁on ▁the ▁night ▁ 1 / 2 ▁June ▁ 1 9 4 2 . ▁N omin ally ▁this ▁was ▁the ▁R AF ' s ▁second ▁ 1 , 0 0 0 ▁bom ber