Ducky...Yep, all in a big hefty letter.
The 2 year bit is all about revenue gathering and keeping them folks at the desks looking busy.
Wouldnt mind if it was 10 years, like a Drivers Licence. Why not perpetual...if you abuse it you lose it, as you will
Lets face it , after all the security checks...if you do something naughty, they'll cancel it immediately anyway 1 year or 8.
Its a classic example of how Oz bureaucrazies grow and get all 'hairy chested', like we are, in all likelihood to get up to no good just because you have/access to an aircraft.
With or without an ASIC a potential terrorist, security cleared or not, and not on the radar , will do what they do regardless of any plastic card.
Did the USA get into this circus for pilots after 9/11?
NO., they asked pilots and airport people to be part of the security system , keep a look out for suspicious activity and report to the appropriate authorities what gives.