While Jones trusted the Oslo Report, the Admiralty thought that the Report was "too good to be true" and was deception by the Abwehr, with its fantastic claims written by psychological warfare experts. An additional argument raised by the doubters was that no person could have such wide knowledge of weapons technology as discussed in the Report. This was mainly because of service rivalry in Britain and the US, and it was known that there was similar rivalry in Germany. The Oslo Report is concentrated on electronic technology; several big German companies were involved in such projects for all three armed forces; some scientists in these companies would have had knowledge of much of the research being conducted.