The US military base Camp Humphreys in Pyeongtaek, South Korea, houses about 41,000 people, including American service members, their families, and Korean nationals. It is the largest American military base outside the United States, spanning 1,372 hectares with nearly a thousand buildings. The base features amenities like Taco Bell, Pizza Hut, and Arby's, as well as school bus routes, baseball diamonds, and American football fields. The US dollar is the currency used, and signage is in English. Beyond the perimeter, military helicopters frequently take off and land.
A Vital Alliance Under Strain
Camp Humphreys serves as the headquarters for United States Forces Korea (USFK), a tangible expression of the alliance between Washington and Seoul that has maintained stability on the Korean Peninsula since the 1953 armistice. However, relations under President Donald Trump have become increasingly transactional, unsettling Seoul. Trade tensions, security guarantee doubts, and threats of troop reductions have raised concerns about the alliance's reliability.
According to Mason Richey, a professor of international politics at Hankuk University of Foreign Studies in Seoul, the alliance retains deep operational ties, but the political surface is far more fraught. When Trump announced a withdrawal of 5,000 troops from Germany in early 2025, Korean media speculated whether South Korea would be next. The defence ministry and presidential office quickly denied any ongoing troop reduction discussions, and USFK stated that the current 28,500 troops is a baseline, not a limit.
Wider Tensions Spill Over
Under Trump, other tensions have emerged, including an immigration raid at a Hyundai-LG battery plant in Georgia and threats to hike tariffs on South Korean goods to 25%. The US also reportedly partially restricted intelligence sharing after a South Korean minister publicly identified a suspected North Korean nuclear site. In April 2025, a data breach at a US-incorporated company stalled talks on nuclear-powered submarine development.
These incidents have sparked debate in South Korea about how dependent it can remain on American protection.
Military Readiness and Expanding Missions
Behind the suburban veneer, Camp Humphreys is a training installation for war. The Vandal Training Center features a pool simulating helicopter crashes, and medical rooms with bleeding mannequins for battlefield evacuation practice. Virtual reality simulators allow units to run combat scenarios globally. An official at the base says the readiness standard is "fight tonight."
While the primary focus remains North Korea, which possesses nuclear weapons and has deployed troops to Ukraine, Washington is recalibrating the division of labour. The Pentagon's national defence strategy states that South Korea can take primary responsibility for deterring North Korea with limited US support. Additionally, the US is pushing to expand its mission beyond the peninsula, with Camp Humphreys located roughly 800 km from Shanghai and under 1,400 km from Taiwan.
USFK commander Xavier Brunson says the base's presence "complicates every calculation" an adversary makes.
South Korean Concerns
In Seoul, there are fears that hosting a launchpad for US regional operations could drag South Korea into unwanted conflict with China. Jaechun Kim, a professor at Sogang University, notes that many South Koreans, particularly progressives, are reluctant to see USFK reoriented toward containing China and worry about entrapment in US-China strategic competition, especially over Taiwan.
Trump's calls for allies to join US-led operations in the Strait of Hormuz have sharpened these concerns.
Despite the tensions, Camp Humphreys is expanding: four new barracks are nearing completion, and a new elementary school is under construction. A sculpture outside USFK headquarters commemorates the alliance, inscribed with the Korean words "함께 갑시다" (hamkke gapsida) — "we go together."
