 He also received his Master of Arts in Economics from New York University, US, in 2002, and a PhD in Economics from University of Bristol, United Kingdom, in 2008.He received appointment as the Commander of Cambodia’s National Counter-Terrorism Special Forces with the rank of Colonel in 2008, with the responsibility to help build Cambodia’s capability to fight against terrorism.He earned the rank of Lieutenant General in June 2013, shortly after being named Deputy Commander of the Royal Cambodian Army and Deputy Chief of Joint Staff of the RCAF.