The country's acquisition of the HIMARS system -- used with devastating effect by Ukraine against Russian forces -- was accelerated after a 2023 defence strategic review.

That review called for a shift toward long-range deterrence, with China's rapid military build-up feeding concerns about the vulnerability of Australia's links to its trade partners and global supply chains.

In response to the findings, the government announced at the time it would spend Aus$1.6 billion (US$1 billion) to expand and speed up delivery of the High Mobility Artillery Rocket System.

The first two of a planned 42 HIMARS launcher vehicles had already arrived from the United States, the government said in a statement, describing the system as a "game changer" that would bolster security in Australia and the region.

"We are making record investments to ensure the Australian Defence Force has the capability it needs, when it needs it to keep Australians safe," said Defence Minister Richard Marles.

Using the Guided Multiple Launch Rocket System and the Precision Strike Missile, HIMARS can strike targets more than 500 kilometres (310 miles) away.

"HIMARS is a world-leading capability, delivering accurate firepower at long ranges, resulting in a more than ten-fold increase in Army's striking range," said Defence Industry Minister Pat Conroy.

As part of its deterrence strategy, Australia has already committed to equipping its navy with stealthy long-range nuclear-powered submarines that could retaliate with a barrage of cruise missiles.