New Zealand is probably one of the most unlikely nations to harbour WMDs (http://en.wikipedia.org/wiki/New_Zealand%27s_nuclear-free_zo...)
(I assume the OP refers to the Iraq war which was justified with WMD that never were found)
We haven't allowed any naval vessel carrying nuclear material (be it for weapons or power supply) to enter our waters since 1984. It's always been quite a point of contention with the US. It also happens to be a point of pride for the grand majority of Kiwis.
From this, the audio is worth listening to. http://www.nzhistory.net.nz/media/sound/oxford-union-debate