To become a Member of the American Women's Auxiliary you do need to be eligible to join. 

Any woman residing in Australia who is one of the following:

• An American Citizen or the spouse/defacto of an American Citizen as a "Full Member"
• An Australian citizen or expatriate of any other country who is not the spouse/defacto of an American Citizen as an "Associate Member"*

* Associate Members share both the privileges and obligations of Full Membership, but cannot hold a Board position nor exercise voting rights.

For further information on Membership see: The AWA Constitution.