The hospital where the Marines were sent had been planning a mass-casualty response training for the day of the real-life emergency.
The island of Mindanao has been reeling from the effects of heavy rain, displacing an estimated 795,000 people.
The Marine Corps pulled the amphibious combat vehicle from most operations in the surf following nonfatal mishaps in 2022.
The service remains on track to recertify all roughly 300 operators of the amphibious combat vehicle on how to operate it safely in water.
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