In 1985 which US ship was refused entry to New Zealand due to it's unconfirmed nuclear status?

USS Buchanan (DDG-14), named for Admiral Franklin Buchanan, was a Charles F. Adams class guided missile armed destroyer in the United States Navy.

Buchanan was laid down by Todd-Pacific Shipbuilding at Seattle, Washington on 23 April 1959, launched on 11 May 1960 and commissioned on 7 February 1962. She was commissioned by the Commandant, Thirteenth Naval District, Rear Admiral George C. Towner.

In February 1985, a port visit request by the United States for the Buchanan was refused by New Zealand, as the Buchanan was capable of launching nuclear depth bomb equipped ASROCs. Following the victory of the New Zealand Labour Party led by David Lange at elections in 1984, the Parliament of New Zealand enacted a law which barred nuclear powered or nuclear armed ships from using New Zealand ports, citing the dangers of nuclear weapons and continued nuclear testing in the South Pacific. Given that the United States Navy refused to confirm or deny the presence of nuclear weapons aboard ships, these laws in effect refused access to New Zealand ports for all ships of the United States Navy.