 Johnson scored more success in July . The USAAF began Blitz Week ; a concentrated effort against German targets . Escorting American bombers , Johnson destroyed three Bf 109s and damaged another , the last being shot down on 30 July ; his tally stood at 18 . There was still no standard formation procedure in Fighter Command , and Johnson 's use of the finger @-@ four made the wing distinct in the air . It earned 144 Wing the nickname " Wolfpack " . The name remained until 144 Wing was moved to an Advanced Landing Ground ( ALG ) at <unk> and was renamed No. 127 Wing RCAF , part of the RAF Second Tactical Air Force under the command of No. 83 Group RAF . 
