The first skilled serial KC-135, created on the basis of 367-80 and elements of a design of 707-s' has flied up in August, 1956. Deliveries in Strategic Aviation Command (SAC) USAF on air base Castle in California have been begun in June, 1957. On the basis of KC-135 their various updatings have been created: scouts, scouts of radio-electronic means of the opponent, scouts of weather, planes for scientific researches, air command points of management and communication with strategic nuclear forces, submarines with ballistic missiles, bombers on a case of destruction of land command points in nuclear war, transportations of command of armed forces of the USA. Now KC-135 both its various military and research updatings continue to fly and will presumably fly till 2040.