One more NC-123B was utilized to be a radio relay plane around the Ho Chi Minh path, with equipment to study the signals from a variety of sensors on the bottom meant to get enemy truck exercise.H?i ??ng x? s? ki?n thi?t mi?n B?c bao g?m 28 ??n v? thành viên, trong ?ó có six ??n v? t? ch?c quay s? chính th?c và c? ??nh hàng tu?n c? th? nh? s