Interpretations of 2001: A Space Odyssey machines". Kubrick was also confronted with the fact that, during the production of the film, the US and USSR had agreed not to put any nuclear weapons into outer space by signing the Outer Space Treaty. Alexander Walker in a book he wrote with Kubrick's assistance and authorisation, states that Kubrick eventually decided that as nuclear weapons the bombs had "no place at all in the film's thematic development", now being an "orbiting red herring" which would "merely have raised irrelevant questions to suggest this as a reality of the twenty-first century". In the Canadian TV documentary "2001 and Beyond",
Interpretations of 2001: A Space Odyssey a consultant on "2001" to the Web site "Starship Modeler" regarding the film's props, observes small details on the satellites such as Air Force insignia and "cannons". In the film, US Air Force insignia, and flag insignia of China and Germany (including what appears to be an Iron Cross) can be seen on three of the satellites, which correspond to three of the bombs stated countries of origin in a widely circulated early draft of the script. Production staff who continue to refer to "bombs" (in addition to Clarke) include production designer Harry Lange (previously a space industry illustrator), who