To be pedantic, it does allow them to dock, it simply insists that they confirm whether or not ehy are carrying nuclear weapons or are nuclear powered even on vessels where the answer is a bleedingly obvious 'no'.
That condition is anathema to the USN hence the lack of ship visits now. But unacceptable conditions are not a blanket ban. And we still allow the US the spy base at Waihopai and the use of CHristchurch to reach MCMurdo and resupply it, etc.
Mighty white of ya, mate; mighty white.
I'll remember that next time I'm looking for a leg of lamb at the store. At least they carry country of origin lables.
Thanks for the info. I've read that NZ is the current 'limp wrist' playground.