In 1934, the government published how the Australian flag should be made. The flag of the United Kingdom, the Union Jack was still the official flag in Australia until 1954. By law, only the Australian government was allowed to fly the blue Australian flag. Everyone else that wanted to use an Australian flag used the red one, called the Red Ensign. In 15 March 1941, the Prime Minister of Australia, Robert Menzies, gave permission for the blue flag to be used on public buildings, schools and by the public. Australian ships would use the Red Ensign.