Sergeant Narongchai Intarakawi, a clerk at the Army’s Ordnance Material Rebuild Centre, posted photographs of documents that he said were evidence of corrupt practices.
The documents stated that the money had been withdrawn to pay for work-related travel when there were no such trips and no receipts had been provided as proof.
He said this was just a small example of corruption in his unit, adding that in other Army units, graft has become a tradition.
“Those who fight corruption will be targeted and eventually dismissed or even prosecuted,” he said in a Facebook post with hashtags #ReformTheArmy and #ThatsOurTax.