▁Air ▁Corps ▁Pro ving ▁Gr ound ▁Det achment , ▁then ▁the ▁Air ▁Corps ▁Pro ving ▁Gr ound ▁Group . ▁ ▁On ▁ 1 ▁May ▁ 1 9 4 2 , ▁the ▁group ' s ▁three ▁original ▁squad rons ▁were ▁dis band ed ▁as ▁it ▁focused ▁on ▁weapons ▁development ▁rather ▁than ▁tact ics . ▁ ▁In ▁ 1 9 4 4 , ▁the ▁group ▁conducted ▁" Operation ▁Cross bow " ▁program ▁to ▁determine ▁the ▁best ▁method ▁of ▁attack ing ▁German ▁V - 1 ▁“ bu zz ▁bomb ” ▁sites ▁along ▁the ▁French ▁and ▁Dutch ▁coast s , ▁February ▁ 1 9 4 4 . ▁▁ ▁Beg an ▁testing ▁the ▁Republic - F ord ▁J B - 2 , ▁an ▁American ▁version ▁of ▁ ▁the ▁German ▁V - 1 , ▁which ▁became ▁the ▁foundation ▁of ▁the ▁Air ▁Force ▁gu ided ▁miss ile ▁program , ▁October ▁ 1 9 4 4 . ▁ ▁The ▁A AF ▁found ▁standard ▁military ▁units , ▁based ▁on ▁relatively ▁inf lex ible ▁tables ▁of ▁organization ▁were ▁prov ing ▁less ▁well ▁adapted ▁to ▁the ▁support ▁mission . ▁ ▁According ly , ▁a ▁more ▁functional ▁system ▁was ▁adopted ▁in ▁which ▁each ▁base ▁was ▁organized ▁into ▁a ▁separate ▁number ed ▁unit . ▁ ▁According ly , ▁the ▁group ▁was ▁dis band ed ▁and ▁the ▁testing ▁mission ▁and ▁associated ▁personnel ▁of ▁the ▁group ▁were ▁assumed ▁by ▁the ▁ 6 1 1 th ▁A AF ▁Base ▁Unit ▁( F light ▁Test ) ▁( l ater ▁ 6 1 1 th ▁AF ▁Base ▁Unit ▁( Proof ▁Test