Along with the national flag, many other Australian flags retain the use of the Union Jack, including the Royal Australian Navy Ensign (also known as the Australian White Ensign), the Royal Australian Air Force Ensign, the Australian Red Ensign (for use by merchant and private vessels), and the Australian Civil Aviation Ensign. The flags of all six Australian States retain the Union Jack in the canton, as do some regional flags such as the Upper and Lower Murray River Flags. The Vice-Regal flags of the State Governors also use the Union Jack. While the Flags Act 1953 states that Australians still have the "right or privilege" to fly the Union Jack after the introduction of the Australian National Flag, usage of the Union Jack by itself is unusual.