First, if it is really a soldier, soldiers are only allowed to wear dark socks (mainly black), and the whole army can't find anyone wearing light socks. Therefore, instructors will strictly require students to wear only black socks according to the management of the army.

Second, sometimes military training will send rubber shoes, which are easy to fade and light socks are easy to get dirty. In addition, the intensity of military training is high, the feet are easy to sweat and the ground is dusty. Wearing light socks will be dirty, so it is recommended to wear black socks even if dark socks are not required.

Third, the vast majority of college students wear black socks and are adults when they go to college. Wearing light socks is too childish. College students love to wear black socks, because they are mature and sunny, and because they are resistant to dirt and easy to wash.