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On August 25, 2026, Thai Prime Minister Anutin Charnvirakul, after chairing a meeting on security affairs, confirmed that the cabinet and the National Security Council (NSC, สมช.) had completed the relevant personnel process, agreeing that the current Army Chief of Staff, Gen. Chaipruek Duangprapat, would become the NSC's new Secretary-General. The appointment means the 58-year-old Chaipruek is set to move from a frontline military command role to become the top civilian administrative official overseeing national security policy — one of the most closely watched personnel changes in the Thai government recently. Within days, the NSC formally passed a resolution confirming Chaipruek's appointment. The post of NSC Secretary-General has historically alternated between civilian officials and military generals; Army general Nathaphon Nakpanich previously held the position, meaning Chaipruek's move is not the first time in the body's history that a serving general has taken on the role. This reshuffle is taking place against the backdrop of the Anutin government's new political landscape: Bhumjaithai, the party Anutin leads, won 193 seats in the House of Representatives election held on February 8, 2026, becoming the largest party in the lower house, after which Anutin was re-elected Prime Minister on March 19 of the same year and formed a new government. Several Thai media outlets view this round of changes to the NSC Secretary-General and Permanent Secretary of the Prime Minister's Office posts as part of the new government's effort to consolidate its security and internal-affairs teams, and as one of the significant security-related personnel changes since this cabinet was formed.

Under the cabinet's earlier decision, current NSC Secretary-General Chatchai Bangchuad will move to become Permanent Secretary of the Prime Minister's Office, replacing incumbent Permanent Secretary Yupha Taveevatkijbovorn, who is due to retire from civil service on September 30. Several Thai media outlets reported that Chatchai still had roughly one year of service remaining as NSC Secretary-General, with his own retirement expected in 2027. Anutin explained that Chatchai's transfer was based on his familiarity with government operations and his ability to coordinate closely with the Prime Minister's Office, while the NSC Secretary-General post required someone better suited to the nature of that role to take over.

Chatchai himself is a senior civilian official at the NSC, described as a longtime 'insider' of the agency, having spent much of his career there. He holds a bachelor's degree in agricultural economics from Kasetsart University and a master's degree in development economics from the National Institute of Development Administration (NIDA). He was appointed the NSC's 25th Secretary-General on October 8, 2024, under the then government of Prime Minister Paetongtarn Shinawatra. Before that, he had long been responsible for the 'peace dialogue' process in Thailand's southern border provinces, having served as head of the Peace Dialogue Panel between the Thai government and separatist movements in the South — making him one of the key civilian officials driving the Deep South peace talks process.

By contrast, publicly available information shows that Chaipruek, who is set to take up the new post, has completed several senior training courses in the Thai military, including a Master of Arts in Military Science from the Army Command and General Staff College (Class 77), the Chief of Staff Course (Class 65), the Infantry Officer Advanced Course (Class 87), and the Airborne Course at the Special Warfare School (Class 180), as well as related training at the National Defence College. Before becoming Army Chief of Staff, he spent a long career in operations, and is regarded as a battle-hardened senior general. Thai media commonly call him by the nickname 'Seth Pu Duang' ('Chief of Staff Pu Duang') or 'Big Pu Duang' — 'Pu' being his personal nickname, and 'Duang' taken from his surname 'Duangprapat.'

As Army Chief of Staff, Chaipruek has personally visited Thailand's southern border areas on multiple occasions in recent times, including travelling to boost the morale of on-duty personnel and local residents after a violent incident at the Tanyongmas market in Narathiwat province, stressing that all sides must continue working to maintain stability and build peace in the border area. In addition, during the armed conflict along the Thailand-Cambodia border in the second half of 2025, Chaipruek repeatedly appeared on the front lines of the border area as well; some Thai media described him as a hands-on general who frequently visits the field himself. That Thailand-Cambodia border conflict, centred on disputed areas around Preah Vihear Temple and Ta Muen Thom Temple, marked a major flare-up of the two countries' decades-long border dispute in the second half of 2025, leaving more than a hundred people dead and forcing several hundred thousand border residents to temporarily evacuate; the Royal Thai Army also launched a military operation codenamed 'Sattawat,' which at one point brought parts of northern Cambodia under its control. The two sides reached ceasefire agreements in July and December 2025 respectively, though the border situation still periodically flares up amid a continued lack of mutual trust. Multiple reports also note that Chaipruek is one of the military figures Anutin knows and trusts well, frequently accompanying him on official duties.

Regarding this personnel change, Anutin told reporters that the criterion for choosing the new NSC Secretary-General was to 'find the right person for the job,' rather than relying purely on seniority, and explained that Chatchai's move to Permanent Secretary of the Prime Minister's Office was because the two of them had built good working rapport based on past experience. According to the latest reports, Chaipruek's appointment as NSC Secretary-General still requires formal approval by the cabinet and, following the customary practice of the Thai civil service, a royal endorsement (โปรดเกล้าฯ แต่งตั้ง), before it takes full effect; at the NSC level, however, consensus on the choice has already been reached. Several Thai media outlets have accordingly referred to him as the 'incoming Secretary-General,' and commonly use the term 'ข้ามห้วย' (literally 'crossing the stream,' meaning crossing the divide between the military and civil-service tracks) to describe his path from Army Chief of Staff to NSC Secretary-General.

The National Security Council is one of the core mechanisms within the Thai government structure responsible for formulating national security policy. Its Office of the National Security Council falls under the Prime Minister's Office, and the Secretary-General is the highest-ranking civilian official of the agency, providing policy advice directly to the Prime Minister and cabinet on national defence, border affairs, cross-border security threats and response strategies, while coordinating the positions of foreign affairs, defence and interior agencies on national security matters. Both the Thailand-Cambodia border situation and security in the southern border area fall within the NSC's areas of focus. The agency is clearly distinct, in both mission and chain of command, from the Internal Security Operations Command (ISOC, กอ.รมน.), which is responsible for ground-level stability operations and is led primarily by the Army. The NSC is a policy body that reports directly to the Prime Minister's Office, with the Secretary-General — a civilian post — as its top official, whereas ISOC has the Prime Minister as its director and the Army Commander-in-Chief as deputy director, and is directly responsible for carrying out internal stability and counter-terrorism operations. Although both bodies fall under the broader 'security' system, their roles are clearly different, and media and the public should distinguish between them carefully to avoid confusion.

Notably, some Thai media outlets, including TOPNEWS, have suggested that one point worth watching in this reshuffle is its possible effect on the future direction of the 'peace dialogue' process in Thailand's southern border area, given that Chaipruek has long served in the southern border region and is familiar with the local security situation, while his predecessor Chatchai was himself one of the main drivers of the Deep South peace talks process. However, as of now there has been no official statement on the specific future direction of the southern peace talks, so this remains a media observation rather than a settled policy position.

This reshuffle comes amid a broader round of security and internal-affairs personnel arrangements within the Anutin government at present, covering both the NSC Secretary-General and Permanent Secretary of the Prime Minister's Office posts. As Chaipruek is set to leave the Army Chief of Staff post to take up his new role at the NSC, the public will continue watching the direction of his work on national security policy, as well as whether this kind of cross-over of a senior general into the civil-service system will affect Thailand's decision-making on the southern border peace talks and Thailand-Cambodia border affairs. As for who will succeed Chaipruek as Army Chief of Staff, no Thai media outlet has yet reported a specific name; an announcement is expected alongside the military's next round of annual personnel reshuffles.