On 8 September 1931, Worton was assigned again to the American Legation Guard in Peking, China, but his job was little but different than his previous Marine Corps duties. Now, as an undercover intelligence officer, he was assigned as "Chinese Language Student" to the Special Language Course. He spent six hours every day for three years with studying of Chinese Language. After this very difficult job, he was qualified as a Chinese language translator and interpreter. During that time, Worton was also promoted to the rank of major on May 29, 1934.