《明史·志·卷六十五》
力士起初隶属旗手卫，后来改成隶属锦衣以及腾壤四个卫，专门负责跟随皇帝的金鼓、旗帜以及守卫四个宫门。
力士先隶旗手卫，后改隶锦衣及腾骧四卫，专领随驾金鼓、旗帜及守卫四门。
The guardsmen were originally subordinate to the Qi Shouwei, but later they were changed to the Jin Yiwei and Tengrang, four guards, and were responsible for following the emperor's drum, flag, and guarding the four palace gates.