M113A - Australian armoured personnel carrier variant
M113A [Milan] - Milan portee variant of the M113A
M113A [Recoilless Rifle] - Rcoilless rifle portee version of the M113A
These should, of course, be M113A1, and both the Milan and 106mm RCL 'portee' variants were designed to have the weapon fired from them, and not dismounted, so not actually a 'portee' in the strict sense of the word.
Other Aust 'one-offs' (or 'two-offs) include the M113A1 with dozer attachement.
Then there are the M113AS2 (four of), M113AS4 (the current vehicle) and other 'AS' (Australian) variants developed in more recent times within Australia, such as the ALV.
Interesting list nevertheless. Thanks Doug.
Mike