Page Halifax, would be arriving in quantity. These technological developments dovetailed with the policy changes influenced by Lindemann's report. Formation Faced with the same navigation problems as the RAF, the Luftwaffe had developed radio aids that were widely used during their bombing campaign, the Blitz of 1940/41. Lacking enough equipment to install in all their aircraft, a single experimental group, Kampfgruppe 100, was given all available receivers and trained extensively on their use. KGr 100 would fly over their target using these systems and drop flares, which the following aircraft would then aim their bombs at. On rare occasions KGr 100 was used as a pure bombing force, demonstrating the ability to drop bombs within 150 yards of their targets in any weather. The KGr 100 unit itself would, in mid-December 1941, be redesignated I.Gruppe/Kampfgeschwader 100, as the basis for a new Luftwaffe bomber wing, or Kampfgeschwader (literally "battle formation") that bore the same unit number. The British, who had developed similar navigation aids, faced the same problem of quantity. Bomber Command expected to have only 300 Gee sets available by January 1942, all of them hand-built examples. Mass-produced models were not expected until May. As it turned out, both predictions proved optimistic. An obvious solution to the Bomber Command's problems would be to simply copy the German technique of placing all available sets in a lead force. This was first proposed by Group Captain S. O. Bufton. Bomber Command's commander-in-chief Arthur "Bomber" Harris argued against the idea, with the backing of the majority of his Group commanders. His view was that an elite group would breed rivalry and envy, and have an adverse effect on morale. Adding fuel to his argument was his own personal dislike for Bufton. His own idea for improving accuracy was to hold competitions within groups to deliver improved bombing. In rebuttal, Sir Henry Tizard, adviser and one of the chief scientists supporting the war effort, responded "I do not think the formation of a first XV at rugby union makes little boys play any less enthusiastically." Studying the German results, notably reports by R. V. Jones, the Air Ministry decided that the technique was sound, and they overrode Harris' objections and forced the matter. Harris responded by suggesting the pathfinders be distributed among the squadrons, but again his objections were overruled, as this would not produce the desired result of having the targets clearly