example, Gruppe II of Jagdgeschwader 3, II./JG 3 was transferred to Jagdgeschwader 1, as Gruppe I and was re-designated I./JG 1., this caused its three Staffeln originally named 4./JG 3, 5./JG 3, 6./JG 3 to be renumbered to 1./JG 1, 2./JG 1 and 3./JG 1. The Staffel usually had a few vehicles allocated to it, and a mobile Fliegerhorstkompanie (air station company) to carry out minor repairs. These were usually named after and attached to a Geschwader. The number of ground staff varied depending on its type, with about 150 for a fighter unit and 80 in a bomber unit – a smaller number of personnel were required in the bomber units as many of the servicing functions were carried out by attached units provided by the local Luftgau or "Air District". The service test units often known as Erprobungskommando could also be of Staffel or Gruppe organizational size, as well as existing outside of any such "set" unit size as a Gruppe or Staffel – the Heinkel He 177 was service-tested by a Staffel-sized unit, known as Erprobungsstaffel 177, frequently using the RLM airframe type number for the number of the unit testing the aircraft bearing it. There were a few types of Staffeln acting in specialized autonomous, or semi-autonomous roles, if integrally attached to a Gruppe or Geschwader for differing duties from the main unit. Some of these were: Jagdbomberstaffel (Jabo) – a fighter-bomber Staffel, within a Gruppe. Predominantly refers to a ground attack Staffel. It was made more prominent by Heinz Knoke with air-to-air bombing of Allied bombers. Luftbeobachtungstaffel, later Wettererkundungsstaffel (Weku or Wekusta) – a Staffel meant for meteorological findings. Zerstörerstaffel, as the northernmost-based of all Luftwaffe day fighter geschwader, JG 5 in northern Norway, had one attached to it as its 13th Staffel. After the mid 1942 successes of Operation Barbarossa, Soviet VVS nocturnal harassment bomber units such as the Night Witches, used obsolete Polikarpov Po-2 biplanes against the invading Germans. The Luftwaffe began to set up their own nocturnal harassment Staffel-sized forces known as Störkampfstaffeln. Eventually Gruppe-sized Nachtschlachtgruppen were used for the same general purpose as the Soviet units. The Luftwaffe's own harassment aviation units also used similarly obsolete aircraft, but of German design. The Heinkel He 46, Arado Ar 66, Focke-Wulf Fw 56 and even the standard training biplane, the Gotha Go 145, were all deployed in their efforts at attempting to emulate