The BRP Miguel Malvar took on water while being towed ahead of a live-fire drill in the South China Sea.
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.
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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