In an operation reminiscent of the Second World War’s island hopping, the U.S. Marine Corps conducted an amphibious and air assault against Iejima Island, a small Pacific island off the coast of Japan, seizing its airfield and strategic points in a rapid and aggressive operation.

More specifically, the 31st Marine Expeditionary Unit (MEU), Air Commandos from the 353rd Special Operations Group, and Green Berets from the 1st Battalion, 1st Special Forces Group, seized the island in an exercise that took place between March 11 and 14.

The operation is clear notification to China’s regional aspirations, and more specifically to its strategy in the South China Sea. That’s where the Chinese military has been manufacturing artificial islands in an attempt to create a defensive shield around the Chinese mainland and protect it from the U.S. Navy’s aircraft carriers.

During the exercise, Force Reconnaissance Marines conducted a free-fall parachute jump to prove close target reconnaissance capabilities to the Marine commander. Afterwards, Marines air-assaulted the island’s airfield with CV-22 Osprey helicopters. The Air Commandos were then able to coordinate air resupply to ensure the force’s sustainability.

“We are not just going through the motions of partnering with other services in our training,” said Maj. Jacob Godby, the assistant operations officer of the 31st MEU, in a press release. “Our joint-service team makes the 31st MEU more ready and lethal, and helps prepare our Marines and sailors for a variety of missions as the forward-deployed crisis response force in the region.”

The training exercise is part of the Expeditionary Advanced Base Operations concept, which is designed to allow Marine Corps units to operate from small forward-deployed bases in various Pacific islands.

Col. Robert Brodie, the commanding officer of the 31st MEU, said in the same press release: “The 31st MEU’s great relationships with Wing, Division and Special Operations Units ensures we are prepared for any crisis. Over the course of two weeks, the MEU aligned capabilities with these forces and led a small island seizure. We are ready to rapidly seize ground and project lethal combat power.”

“The Indo-Pacific region is incredibly dynamic, so we prepare and train daily for real world crises,” added Colonel Brodie.