Blue Ensign
In the 1920s there was debate over whether the blue ensign was reserved for Commonwealth buildings only, culminating in a 1924 agreement that the Union Flag should take precedence as the National Flag and that state and local governments were henceforth able to use the blue ensign. A memo from the Prime Minister's Department dated 6 March 1939 states that: "the Red Ensign is the flag to be flown by the public generally" and the federal government policy was "The flying of the Commonwealth Blue Ensign is reserved for Commonwealth Government use but there is no reservation in the case of the Commonwealth Merchant Flag, or Red Ensign".