So what you mean is the US suspended itself!
The US tried to impose on NZ an obligation to accept nuclear ships into our harbours, NZ declined to tolerate this imposition on national sovereignity which the US took as a serious afront to its mana and in an effort to save face, or just a fit of picque, kicked over the treaty table!
New Zealand continues to provide military aid to the US every minute of every day, I dont know what we get in return.
BTW, NZ was attacked by the military of another country in July 1985 and the worth of the ANZUS treaty was amply demonstrated by the actions of the US and Australia (to a lesser extent). Now, at what date did the US 'suspend' itself from the treaty with NZ? 1986 IIRC.