That's odd. Not sure why it didn't work. I've copied the instructions below:
Go to our homepage (naa.gov.au). Select Search the collection link on the homepage
Select RecordSearch. You will be taken to the Basic search…"
Records of which birthdates were drawn in the 1965-1972 National Service ballots can be found in the file below:
National Service Ballots (list of birthdates drawn in the National Service Ballot held on 10 March 1965 - 22…"