the third scout and raiders organization deployed to fight with the sino-american cooperative organization (saco) in china. admiral ernest j. king ordered that 120 officers and 900 enlisted sailors be trained for "amphibious roger" at the amphibious roger school at fort pierce, florida in order to support this mission. they formed the core of what was envisioned as a "guerrilla amphibious organization of americans and chinese operating from coastal waters, lakes and rivers employing small steamboats and sampans." elements of the third scouts and raiders saw active service conducting surveys of the upper yangtze river in the spring of 1945 and, disguised as coolies, conducting a detailed three-month survey of the chinese coast from shanghai to kitchioh wan, near hong kong. the majority of the force remained garrisoned at camp knox in calcutta, india.