Marines from South Korea and the United States gather together for photos after an amphibious landing during the multi-nation Cobra Gold military exercises in Chonburi, Thailand on Saturday, February 16, 2019. [Photo: AFP]"

A U.S. Marine looks down the scope of his rifle during an amphibious landing that was part of the multi-nation Cobra Gold military exercises in Chonburi, Thailand on Saturday, February 16, 2019. [Photo: AFP]"

American and Thai soldiers approach the beach during an amphibious landing as part of the multi-nation Cobra Gold military exercises in Chonburi, Thailand on Saturday, February 16, 2019. [Photo: AFP]"

U.S. Marines guard an amphibious assault vehicle during an amphibious landing as part of the multi-nation Cobra Gold military exercises Chonburi, Thailand on Saturday, February 16, 2019. [Photo: AFP]"

U.S. Navy paragliders during an amphibious landing as part of the multi-nation Cobra Gold military exercises in Chonburi, Thailand on Saturday, February 16, 2019. [Photo: AFP]"

A U.S. Marine drinks snake blood during jungle survival training with Thai soldiers in the joint Cobra Gold military exercises in Chantaburi, Thailand on Thursday, February 14, 2019. [Photo: AFP]"