Secret training camps were set up in remote areas, the majority by the populist politician Tiang Sirikhanth in the northeast region of the country. There were a dozen camps alone in Sakhon Nakhon Province. Clandestine airfields also appeared in the northeast, where Royal Air Force and United States Army Air Forces planes brought in supplies, as well as Special Operations Executive, Office of Strategic Services, and Seri Thai agents, at the same time evacuating escaped prisoners of war. By early 1945, Thai air force officers were performing liaison duties with South East Asia Command in Kandy and Calcutta.