The US and Australia's alliance is looking to future battlefronts in cyber, hypersonic and electronic warfare, a US senior official says.
Christine Wormuth, the US undersecretary of defence for policy, says while the countries' traditional relationship will continue - such as fighting Islamic State jihadists in Iraq and Syria as part of an international coalition - their joint security efforts include new frontiers of science and technology.
"Our co-operation there cuts across a number of rapidly evolving fields like electronic warfare, hypersonics and a variety of initiatives in the cyber domain," she said in a speech at the Brookings Institution in Washington DC.
The US also hopes to increase the number of Marines it deploys to Darwin.
"This year about 1150 Marines have come through Australia on a rotational basis and over the coming years we are working with Australia to be able to rotationally deploy as many as 2500 Marines on a yearly basis," she said.
