The Boeing KC-135 is a military aerial refueling aircraft developed by Boeing in the 1950s. It is designed to extend the range and endurance of military aircraft by transferring fuel in-flight. The KC-135 can refuel various types of aircraft, including fighters and bombers, using its boom and hose-and-drogue systems. The KC-135 has played a crucial role in numerous military operations and is a key component of the United States Air Force (USAF) fleet. With its distinctive fuselage and high-mounted wings, the aircraft has been continuously upgraded to enhance its capabilities and maintain operational effectiveness.