Here in the land downunder it is pretty clear, and only in the last month a male person was convicted of fasely claiming to be an ex serviceman

Below is a precis of the relevent legislation

In Australia the key legislation is the Defence Act 1903 (Cth), strengthened in 2003.

Section 80A of that Act prohibits an individual from falsely claiming to be a returned serviceperson. Section 80B prohibits wearing of medals to which the person is not entitled (provision is made for wearing in films/videos and by family members of deceased veterans), with 80B(4) requiring that "a person shall not falsely represent himself as being the person upon whom a service decoration has been conferred".