The Transition to JFHQ at the U.S. Forces Japan Command Begins: 215 Personnel Increase for 24-Hour Operations, Japan-U.S. Command and Control Moves to a New Stage

In August, the first rotation personnel arrived at Yokota Air Base. These "plankholders," selected from the U.S. Indo-Pacific Command, are the first group supporting the transition to the Joint Forces Headquarters (JFHQ) of the U.S. Forces Japan (USFJ). Their term is six months. While this may seem like an inconspicuous transfer, it marks a turning point that fundamentally changes the command and control (C2) structure of the Japan-U.S. alliance since World War II.

From Coordination Headquarters to Operations Command

In a nutshell, the traditional role of USFJ was that of a "base management headquarters." As a subordinate command under the Pacific Command (now the Indo-Pacific Command), it did not possess operational command authority, with its main duties being the management of U.S. military bases in Japan and coordination between Japan and the U.S. In contrast, the current transition to JFHQ aims to transform USFJ into a command that can jointly plan and coordinate operations with Japan in times of emergency.

Air Force Lieutenant General Stephen Jost (USFJ Commander) stated in a press conference with media, including the Asahi Shimbun, on July 24, "The capabilities that were impossible a year and a half ago have now become a reality." A specific example he cited was the Japan-U.S. joint integrated disaster response exercise "Joint Exercise Rescue," conducted from July 21 to 24. In this command post exercise, which assumed the simultaneous occurrence of a massive earthquake in the Nankai Trough and a nuclear power plant accident, USFJ played a significant role for the first time. Commander Jost made it clear that "before the transformation, participation at this level was not possible."

Breakdown of the 215 Personnel Increase

The scale of the personnel increase at USFJ is approximately 215 since the start of the reorganization. Of these, about 100 will be engaged in developing procedures for the "Bilateral Operations Coordination Center" (BOCC) to be established with Japan's Joint Operations Command (JJOC). About 20 will be stationed at the Akasaka Press Center to handle daily coordination with the Ministry of Defense and JJOC.

According to Commander Jost, this increase allows the command to maintain a 24-hour posture for a wide range of "combat functions," including logistics, medical support, and communications. His statement that "the command has reached a personnel level that can maintain broader capabilities 24 hours a day, 365 days a year" indicates a transition to a posture based on emergency response rather than peacetime enhancement.

Connection with Japan's Joint Operations Command

The most critical factor determining the success of the JFHQ transition is the connection with Japan's counterpart, JJOC. JJOC is a unified command that will operate the Ground, Maritime, and Air Self-Defense Forces, set to be established in March 2025, and is located in Ichigaya. Last year, USFJ established the "Japan Self-Defense Forces Joint Operations Command Cooperation Team" to handle coordination with JJOC and included them in this joint exercise.

Commander Jost has divided the transformation into three phases. The first phase is the establishment of the liaison team (already completed), the second phase is the development of the BOCC standard operating procedures (SOP) (currently in progress), and the third phase aims for completion by spring 2028. While the phased approach itself is reasonable, the target year of 2028 indicates that this transformation requires substantial institutional development, rather than being merely a change of signage.

The Strategic Significance of "Dissolving Dual Roles"

Another important change is the dissolution of the dual roles of the USFJ Commander and the 5th Air Force Commander. In March, Lieutenant General Jost handed over the position of 5th Air Force Commander to Lieutenant General Joel Carey and has now focused solely on the role of USFJ Commander. This resolves the previous situation where one general officer simultaneously held the disparate tasks of "base management" and "command of U.S. Air Force capabilities in Japan."

While this may seem like a minor administrative adjustment, it represents a significant change from the perspective of those familiar with command operations on the ground. The structure that divided the commander’s attention during a crisis could become a fatal weakness for the alliance's command and control.

Transformation Driven by the Threat from China

Commander Jost is clear about the threat perception underlying this transformation. In a contribution to the Asahi Shimbun, he stated, "The security, freedom, and prosperity of the Indo-Pacific are facing increasing challenges from hostile nations led by the People's Republic of China," emphasizing the urgency of combat readiness.

Viewed in isolation, this transformation is merely an increase of 215 personnel and an organization restructuring. However, when combined with Japan's concurrent defense capability enhancements—such as the 8.9 trillion yen budget request for fiscal year 2027, the accelerated deployment of stand-off long-range missiles, and the "sustained combat" concept in the 2026 defense white paper—a different picture emerges. The Japan-U.S. alliance is quietly beginning to transition from the previous "division of roles model" (shield and spear) to a "joint command model."

Overlooked Risks

However, in my view, there are two issues that need to be considered regarding this transformation.

First is the issue of command status. The USFJ spokesperson has clearly stated, "There are no plans to upgrade to a four-star command." Remaining a three-star command under the Indo-Pacific Command (four-star) limits the speed and weight of political decision-making in a crisis. This also creates asymmetry with the U.S. Forces Korea (four-star) in South Korea.

Second, and more fundamentally, is the divergence between the organizational chart and actual operations. Even if a 24-hour posture is achieved with the increase of 215 personnel, this pertains to routine command functions. Whether the USFJ-JJOC bilateral coordination mechanism can withstand a simultaneous flood of information during extreme tensions, such as large-scale Chinese exercises or a Taiwan Strait crisis, is an entirely different issue. While this joint disaster response exercise is a good first step, the scenario involved natural disasters, which qualitatively differ from the complexities of military crises involving hostile actors.

The true challenge lies not in the command's signage or personnel numbers, but in whether the speed of information sharing and decision-making between Japan and the U.S. can keep pace with the speed of Chinese actions.