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A Japanese destroyer performed surveillance and tracking exercises during the test, marking the first time any US ally has taken part in a US missile defense intercept test, the US Missile Defense Agency said.
It said the Japanese destroyer and a US Navy Aegis destroyer performed surveillance and tracking exercises during the test.
A third Aegis destroyer used in the test linked up with a land-based missile defense radar to evaluate the ship's ability to receive and use target cueing data from missile defense command centers.
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