The visit also marked the 60th anniversary of the Anzus military alliance between the two nations.

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We will be looking back during this visit -- we'll be looking back at 60 years of the ANZUS alliance.

WHITEHOUSE: President Obama��s News Conference with Prime Minister Gillard of Australia | The White House

His hosts briefed him about the Darwin plan, explaining it as continuation of a longstanding military partnership under the ANZUS Treaty signed in 1951.

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In the United States, we will never forget how Australia invoked the ANZUS Treaty -- for the first time ever -- showing that our two nations stood as one.

WHITEHOUSE: President Obama Speaks to the Australian Parliament