OITA, Japan — April 21, 2026 : Three members of the Japan Ground Self-Defense Force (GSDF) were killed and one seriously injured after a tank shell detonated prematurely inside a Type 10 main battle tank during a live-fire training exercise at the Hijudai maneuver area in Oita Prefecture.
According to GSDF officials, the incident occurred at approximately 8:40 a.m. on April 21 during a scheduled firing drill conducted by the Western Army Tank Unit, which is based at Camp Kusu. The unit was carrying out target practice when a 120mm anti-tank high-explosive shell exploded inside the tank’s turret before it could be fired.
Incident Details and Casualties
At the time of the explosion, four crew members were inside the vehicle. Three personnel positioned within the turret were killed instantly. They have been identified as Sgt. 1st Class Kentaro Hamabe (45), serving as tank commander; Sgt. Shingo Takayama (31), the gunner; and Sgt. Kozo Kanai (30), the safety officer. All were assigned to the Western Army Tank Unit.
The fourth crew member, the driver — a female GSDF member in her 20s — survived the blast but sustained severe injuries, including serious facial burns. She was airlifted to a hospital and remained conscious during transport, according to officials.
Location and Training Context
The Hijudai maneuver area, a major GSDF training facility spanning approximately 5,000 hectares, extends across parts of Yufu city and the towns of Kokonoe and Kusu in southwestern Japan. The site is routinely used for armored and live-fire training exercises by the Western Army Tank Unit.
The Type 10 main battle tank, which entered service in 2011, is Japan’s most modern armored platform. Developed by Mitsubishi Heavy Industries and equipped with a 120mm smoothbore gun manufactured by Japan Steel Works, the tank incorporates advanced fire-control systems and an autoloader mechanism. It is capable of carrying up to 36 rounds of ammunition.
Immediate Response and Investigation
GSDF Chief of Staff Gen. Masayoshi Arai confirmed the details of the incident at a press briefing, stating that the ammunition involved was a 120mm anti-tank high-explosive shell. He announced that all live-fire exercises involving Type 10 tanks have been suspended as a precautionary measure.
The suspension has also been extended to Type 90 tanks, as they utilize the same category of 120mm ammunition. In addition, all drills involving dummy rounds have been halted. The GSDF has established a formal investigation committee to determine the cause of the premature detonation.
Preliminary areas of investigation include the possibility of a malfunction in the tank’s autoloader system, a defect in the ammunition, or procedural factors during the loading and firing process. Investigators from the GSDF, along with local authorities, have begun a forensic examination of the damaged turret and related components at the training site, which has been closed to further exercises.
Government Response
Prime Minister Sanae Takaichi issued a statement on April 21 expressing condolences to the families of the deceased personnel and acknowledging the seriousness of the incident. In a message posted on the social media platform X, she stated that the government would work to determine the exact cause and ensure thorough safety management to prevent recurrence.
Defense Minister Shinjiro Koizumi also addressed reporters at the National Diet building in Tokyo, confirming that the Ministry of Defense is coordinating closely with GSDF officials to verify details and support the ongoing investigation.
Operational Impact
The indefinite suspension of live-fire exercises involving both Type 10 and Type 90 tanks represents a significant interruption to GSDF armored training activities. The decision reflects concerns that the issue may not be limited to a single platform but could involve shared ammunition or system components.
No additional information regarding the precise cause of the explosion has been released. Authorities stated that updates will be provided as the investigation progresses.
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