The Defense Security and Cooperation Agency (DSCA) estimated the value of the sale at as high as 350 million dollars.

Aegis systems are centered on a sophisticated computerized command system that can cue air defense missiles to enemy missiles and aircraft detected by targeting radar. Using its AN/SPY-1 phased array radar, it can track over a hundred targets simultaneously.

Noting Australia's strategic location, the DSCA said helping the Royal Australian Navy (RAN) modernize its fleet of surface warships was vital to US interests.

"The procurement also aids in maintaining the US Navy (USN) production base and will improve interoperability between RAN and USN forces," it said. "This proposed sale is consistent with those objectives, and facilitates burden sharing with our allies."

Lockheed-Martin Maritime System and Sensors, Raytheon, General Dynamics are the principal contractors, DSCA said.

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