Clandestine military involvement by the U.S. began following the series of uprisings in the eastern Tibetan region of Kham in 1956. Several small groups of Khampa fighters were trained by the CIA camp and then airdropped back into Tibet with supplies. In 1958, with the rebellion in Kham ongoing, two of these fighters, Athar and Lhotse, attempted to meet with the Dalai Lama to determine whether he would cooperate with their activities. However, their request for an audience was refused by the Lord Chamberlain, Phala Thubten Wonden, who believed such a meeting would be impolitic. According to Tsering Shakya, "Phala never told the Dalai Lama or the Kashag of the arrival of Athar and Lhotse. Nor did he inform the Dalai Lama of American willingness to provide aid."