What happened in Gallipoli still resonates bitterness in NZ and Australia. It was shameful. But it seems the Aussies have gotten over it.
Australia has the experience of being under direct threat in the Second World War, which New Zealand did not have. I think Australians just have a better understanding of the fact that you fight alongside your allies, because one day you might
need them fighting alongside you.
While New Zealand has provided fine service in some wars, they still military action as something you undertake to protect others, not out of self protection.