OPINION: A nation that relies as heavily as NZ does on functional global shipping lanes will have to do its bit on the international security front, hence the additional $1.58b in military spend over 4 years that Dame Lynda Topp thought should have been spent on sheet music.
It's the price we must pay to secure some measure of defence alliance and safe passage for the $50-60b the ag sector ships abroad every year.
For the same reason, our Aussie mates are buying secondhand subs off the Yanks.
A mate of yours truly quipped, the old subs "will be the equivalent of turning up to a Holden dealer expecting to pick up a new Calais and then being chucked the keys for a rooted old Captiva that's blowing a bit of blue smoke with all the clearcoat peeling off the bloody thing!"