[3] Khong also attended the Air Command and Staff College and graduated with a Master of Military Operational Art and Science degree in 2008.

He subsequently completed a Master of Business Administration at the International Institute for Management Development in 2012.

[4] Khong enlisted in the Singapore Armed Forces in 1995 and served as a pilot in the Republic of Singapore Air Force (RSAF), operating the General Dynamics F-16 Fighting Falcon and McDonnell Douglas F-15SG.

[5][6] On 22 March 2019, Khong succeeded Mervyn Tan as Chief of Air Force.

[1] Under his leadership, the RSAF began the acquisition of the Lockheed Martin F-35 Lightning II, achieved full operational capabilities for the A330 Multi-Role Tanker Transport and the Aster 30 Ground Based Air Defence system,[2] and participated in several Humanitarian Assistance and Disaster Relief missions, such as the bushfire and flood relief operations in Australia,[7][8] the airlift operations of Afghan evacuees from Qatar to Germany,[9][10] and the delivery of humanitarian aid to Gaza.