Australia introduced conscription, New Zealand sent only a token force. Australia has continued to be more committed to the American alliance, ANZUS, than New Zealand; although both countries felt considerable unease about American military policy in the 1980s, New Zealand angered the United States by refusing port access to nuclear ships into its nuclear-free zone from 1985 and in retaliation, the United States 'suspended' its obligations otherwise owed under the alliance treaty to New Zealand. Australia has made a significant contribution to the Iraq War, while New Zealand's much smaller military contribution was limited to UN-authorised reconstruction tasks. Anzac Bridge in Sydney was given its current name on Remembrance Day in 1998 to honour the memory of the ANZAC serving in World War I. An Australian flag flies atop the eastern pylon and a New Zealand flag flies atop the western pylon. A bronze memorial statue of a digger holding a Lee–Enfield rifle pointing down was placed on the western end of the bridge on Anzac Day in 2000. A statue of a New Zealand soldier was added to a plinth across the road from the Australian Digger, facing towards the east, and unveiled by Prime Minister of New Zealand Helen Clark in the presence of Premier of New South Wales Morris Iemma on Sunday 27 April 2008. In 2001 the Australia–New Zealand Memorial was opened by the prime ministers of both countries on Anzac Parade, Canberra. The memorial commemorates the shared effort to achieve common goals in both peace and war. Joint defence arrangements involving both countries include the Five Power Defence Arrangements, ANZUS, and the UK-USA Security Agreement for intelligence sharing. Since 1964, Australia, and since 2006, New Zealand have been parties to the ABCA interoperability arrangement of national defence forces. ANZUK was a tripartite force formed by Australia, New Zealand and the United Kingdom to defend the Asian Pacific region after the United Kingdom withdrew forces from the east of Suez in the early seventies. The ANZUK force was formed in 1971 and disbanded in 1974. The SEATO anti-communist defence organisation also extended membership to both countries for the duration of its existence from 1955 to 1977. Exploration The Australasian Antarctic Expedition 1911–1914 established radio connection back to Tasmania via Macquarie Island, surveyed King George V Land and examined the rock formations of Wilkes Land. Mawson's Huts at Cape Denison survive to the current day as habitations