In September 2016, he was chosen to serve as the Commander in Chief of the Royal Thai Army, and was endorsed by then-King Bhumibol Adulyadej.

Chalermchai start working after graduated from the military school at Royal Thai Army Special Warfare Command as a special operations force officer so that Chalermchai's appointment marked a departure from the Burapha Payak royalist military faction - known as the "Eastern Tigers", as he is considered to not have ties with the dominant faction.

[1][2][3] Chalermchai study in primary and secondary at Benjamaratrangsarit school at Chachoengsao Province and then attending the Armed Forces Academies Preparatory School as a pre-cadet as a prerequisite for attending Chulachomklao Royal Military Academy (CRMA), Class 16.

Almost immediately following his retirement, he was appointed to the Privy Council.

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