The UH-72 helicopter lost contact on Sunday while returning from Pai district in the mountainous northwest where it had been conducting flood relief operations, said junta spokesman Colonel Winthai Suvaree.
The northwest has suffered flash floods caused by heavy rainfall.
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All were killed in the crash, Winthai added.
The helicopter came down near the city of Chiang Mai, close to Thailand's highest peak - a region that is difficult to access.
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