Well you know the RSAF, secrecy over good sense 
Yes, all visits to USN ships have stopped since Sept 11, I was
trying to wrangle a visit to the Carl Vinson when she stopped here
in Singapore over Christmas but they said NO, as we found out later
due to the arrests. Pity, becos her birds wouild have all the
Enduring Freedom nose art and mission marks.
Melbourne has had USN ships, a AEGIS cruiser and destroyer from the
constellation CVBG stopped over in Melb while the carrier was in
Sydney, and I went on board then. No CV/CVN or LHD/LHA/LPD though,
Port Philip Bay is too shallow for those... 
I did go with a friend to the Kitty Hawk in Sydney though, took
overnight buses to and fro from Melb. It was his 1st carrier so he
was really keen, I've been to quite a number of ships already, Carl
Vinson, Abe Lincoln, Kitty Hawk, Boxer(LHD), Chosin(CG),
Benfold(DDG), Siroco(French Navy LST), an Austin-class LPD(forgot
the name), 3 Indian Navy ships and an Italian carrier so far. Great
fun!
