Army helicopter crossed into DMZ as tracking system failed during wildfire operations

South Korea's Joint Chiefs of Staff said an Army helicopter's incursion into the Demilitarized Zone last March occurred because "various factors combined" to prevent the relevant tracking system from functioning properly, at a time when multiple firefighting helicopters were operating in the area due to nearby wildfires.

The Joint Chiefs made the statement Monday, adding that personnel and units confirmed to have violated regulations had been "strictly dealt with in accordance with the rules."

The helicopter, belonging to the Army's 5th Corps, was dispatched on March 23 to help fight a wildfire in Yeoncheon, Gyeonggi Province — an area under the jurisdiction of the 1st Corps — when it accidentally entered the DMZ. The Army operates a Helicopter Positioning System (HAPS) that tracks helicopter locations in real time, but none of the units involved were monitoring it. The incursion came to light only after the Air Force, which had detected the helicopter through radar air-defense surveillance, notified the Army.

The DMZ extends 2 kilometers on either side of the MDL and serves as a military buffer zone where military aircraft are in principle prohibited from entering. Despite this, the helicopter remained inside the DMZ for about seven minutes.

Army headquarters issued a "Caution" to the Ground Operations Command, which oversees forward corps, and a notification to the Aviation Command, which controls Army aviation operations, earlier this month, according to officials. The 1st Corps and 5th Corps, which bear direct responsibility for tracking and controlling the helicopter, had already received a "Warning" in July. The disciplinary actions followed a probe by the Joint Chiefs' operational readiness inspection office, which investigated the incident and requested institutional penalties from the Army.

The Joint Chiefs' investigation found that no Army unit at any level had detected the helicopter's entry into the DMZ. The pilot, finding that the wildfire at the originally assigned location had already been extinguished, is believed to have crossed into the DMZ while attempting to fight a separate fire visible nearby.

The 1st Corps, which oversees the area, reportedly mistook the helicopter for a civilian firefighting aircraft, while the 5th Corps — the helicopter's home unit — along with the Ground Operations Command and Aviation Command, are believed to have not been monitoring its position. The situation came to light only after the Air Force's Master Control and Reporting Center contacted the Army.

"Our military recognizes the gravity of this matter and has established fundamental measures to prevent recurrence, carrying out thorough follow-up actions," a Joint Chiefs official said.