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His studies were interrupted by the war in Europe where he served as an armored car commander in a reconnaissance squadron during the push from Calais to Berchtesgaden, earning two battle stars and a Purple Heart.
His military decorations include the Meritorious Service Medal with one oak leaf cluster, the Army Commendation Medal with one oak leaf cluster, the Army Achievement Medal, the National Defense Service Medal with one bronze service star, the Korea Defense Service Medal, the Army Overseas Service Ribbon, and the Army Service Ribbon.
Yeoh was a Public Service Star (B.B.M.) recipient, an active Rotarian, and a Justice of the Peace who also served as chairman of various boards including the Detainees' Aftercare Association and the University of Singapore Council.