Heather i feel he was not in the british navy At the time ,i think that he could well have just worked on the steamships.
The licence was issued in 1920,he was probably staying in america for some reason.
The only way he could get back to Australia was to work his Passage.
So applied for a temporary Licence.
This allowing him to work on a ship going back to Australia
may not have had the money for the passage back
as you said he May have been in the navy,But Quit
Complicated little Prob,jelora Our manager in America has not seen these Licences before.So new to her
I sent her it by mail so she could see it
Hopefully you will hear back
Take care
Mike