The exercise marks the first time the aerial defense system has been deployed outside the U.S. with a U.S. Marine Corps unit.
Thousands of allied American and Filipino forces have opened annual combat drills that will include simulating the defense of the Philippines.
A Chinese military ship monitored the maneuvers off the Scarborough Shoal from a distance.
This year's exercise marks 40 years of joint drills aimed at strengthening the U.S. and Philippines' defense capabilities in the Indo-Pacific.
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