The United States is expanding its military footprint in the Philippines, transforming the island nation into a key outpost for countering China’s ambitions in the region. At the center of this buildup is Luzon—the Philippines’ largest and northernmost island—just 155 miles from Taiwan. As tensions rise over the Taiwan Strait and the South China Sea, both Washington and Manila are preparing for what many now view as a possible future conflict with Beijing.

The U.S. Army’s 25th Infantry Division has been conducting major training operations across Luzon, testing new battlefield technologies, including 3D-printed drones, long-range missile systems, and mobile artillery. These activities are part of Operation Pathways, the Army’s broader strategy to establish a strong ground-based deterrent in the Indo-Pacific.

Gen. Marcus Evans, who commands the division, emphasized the urgency. “Operating in a jungle or archipelago environment provides tough, realistic training opportunities for our soldiers in the environment and conditions where we are most likely to operate,” he said, pointing to the looming threat of Chinese aggression.

Beijing’s Shadow Over the Philippines

The expansion of U.S. forces is a direct response to the growing military assertiveness of China. Beijing has made sweeping claims over nearly the entire South China Sea and has increased its military presence near Taiwan, regularly flying warplanes across the island’s air defense zone. Chinese vessels have also harassed Filipino fishermen and coast guard ships in disputed waters.

Officials in Manila fear that a Chinese attack on Taiwan could spill over into their territory. Gen. Romeo Brawner, Chief of Staff of the Armed Forces of the Philippines, recently ordered his troops in Northern Luzon to “prepare for the impact” of a possible invasion. The concern is clear: if Taiwan falls, China’s military presence will sit on the Philippines’ doorstep.

“If we lose Taiwan, then China becomes our neighbor,” warned a prominent Filipino naval strategist. “And our entire northern territories will be under threat.”

These fears are shaping Philippine policy. President Ferdinand Marcos Jr. has approved expanded joint drills with U.S. forces and authorized the deployment of advanced American weapons systems, including the ground-based Mid-Range Capability launcher, which remains in the Philippines despite Chinese protests.

Building a Battlefield on Filipino Soil

The 2025 Salaknib and Balikatan exercises are the largest and most complex in the history of U.S.-Philippine cooperation. U.S. and Filipino troops have been simulating joint operations across the jungle and mountainous terrain of Luzon. They are training for long-range air assaults, coastal missile strikes, and rapid force deployment in areas that could become combat zones if war breaks out.

One major innovation has been the deployment of 3D printers to produce first-person view (FPV) drones and parts in the field. These drones, originally capable of flying only 5 kilometers, were upgraded on the spot to reach 30 kilometers and fly for an hour—crucial enhancements in a fast-moving conflict.

“We are using these assets near simultaneously across the area of operation to flood the zone and build redundancy in the see, sense, strike and protect ecosystem,” said Gen. Evans.

In addition to drones, the Army brought a mobile water purification system and deployed over 20 helicopters—including Blackhawks, Chinooks, and Apaches—to conduct air assaults on remote islands like Calayan and Mavulis, which lie directly in the path of any future Chinese expansion.

The exercises also tested the ability of U.S. and Philippine forces to move quickly through congested ports, muddy jungle roads, and narrow mountain passes. Soldiers with mobile missile launchers had to navigate low-hanging power lines and swampy terrain. “Getting from A to B can be a challenge in the Philippines,” said Sgt. 1st Class Shaun Moore, a master gunner involved in the operation.

A Clear Message to Beijing

The U.S. presence in the Philippines is not just for show. Secretary of Defense Pete Hegseth, during his visit to Manila, described the military relationship as an “iron-clad commitment” and said the second Trump administration was “truly prioritizing a shift to Asia in recognition that for the 21st century to be a free century, Washington needs to stand alongside our allies and partners shoulder to shoulder.”

The U.S. has increased arms sales to Manila, including a $5.58 billion deal for 20 F-16 fighter jets. Unlike with other allies, the Trump administration has exempted the Philippines from aid freezes and is likely to boost military funding further. While U.S. allies like Japan and South Korea have been pressured to spend more on defense, Washington has taken a much more supportive stance toward the Philippines.

That support comes with expectations. As Pentagon strategist Elbridge Colby has explained, allies like the Philippines will need to “forego any strategic hedging” and fully align with U.S. efforts to contain China. The Marcos administration initially hesitated on some moves, including a Pentagon-backed plan to build a port in Batanes, just 100 miles from Taiwan. But in the past year, Manila has embraced its new frontline role.

The Philippines has expanded its own naval base near Taiwan and expressed openness to hosting a weapons storage and production facility. It is also allowing joint patrols with U.S. forces near the Bashi Channel, a critical maritime chokepoint that China would likely try to seize in any conflict with Taiwan.

The Costs of Partnership

The Filipino military has praised the partnership. Philippine commanders have credited U.S. support with helping transform their forces from counterinsurgency operations to full-spectrum territorial defense. But the public is more cautious. Some Filipinos worry that this partnership could provoke China into retaliation or pull the Philippines into a war it cannot control.

At the same time, many in the country recognize that ignoring the threat from Beijing is no longer an option. The choice is no longer about neutrality, but about survival in a rapidly changing strategic environment.

As one Filipino official put it, “The front line has moved to our doorstep. And we can’t afford to look away anymore.”