A file of correspondence concerning Australian security arrangements and the sharing of intelligence between Britain, the United States of America, and Australia. The letters discuss American-Australian information sharing arrangements; American threats to stop sharing information with Britain due to their fears that a scientific exchange programme could pose a security threat; attempts to resolve the crisis without informing the Australians of the poor American view of their security arrangements; Australian improvements to their security apparatus; and arrangements for a senior Australian army officer to visit Washington for talks with the Americans.