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| McDonnell Douglas KC-135 Stratotanker | |
|---|---|
| Name | McDonnell Douglas KC-135 Stratotanker |
| Caption | KC-135R of the United States Air Force in flight |
| Role | Aerial refueling tanker and transport |
| Manufacturer | McDonnell Douglas |
| First flight | 1956 |
| Introduced | 1957 |
| Status | In service (limited) |
| Primary user | United States Air Force |
| Produced | 1956–1965 |
| Number built | 841 |
McDonnell Douglas KC-135 Stratotanker is a strategic aerial refueling aircraft developed in the 1950s by Boeing predecessor McDonnell Douglas for the United States Air Force to extend the range of strategic bombers and tactical aircraft. Designed alongside contemporaries such as the Boeing 707, the KC-135 provided critical support during the Cold War, Vietnam War, Operation Desert Storm, and operations over Iraq and Afghanistan. Its long service life involved upgrades by contractors including Boeing, Tucker, and GE Aviation, allowing interoperability with platforms like the Lockheed C-5 Galaxy, Boeing B-52 Stratofortress, F-16 Fighting Falcon, and F-22 Raptor.
The KC-135 emerged from a 1954 United States Air Force request to replace piston-driven tankers supporting the Strategic Air Command and to enable continuous airborne alert during the Cold War. McDonnell Douglas adapted the fuselage and wing concepts of the Boeing 367-80 and Boeing 707 family while integrating a military-specific airframe optimized for the Boeing B-47 Stratojet and Convair B-36 Peacemaker era. Early prototypes used Pratt & Whitney J57 turbojet engines, linking development to engines used on the F-100 Super Sabre and Sukhoi Su-15 contemporaries, before later reengining programs introduced CFM International CFM56 engines for improved fuel efficiency and reduced noise to comply with ICAO and FAA standards. Design choices reflected lessons from Operation Chrome Dome and aerial refueling practices pioneered by units such as the 391st Bombardment Group and squadrons stationed at Andrews Air Force Base and Westover Air Reserve Base.
The KC-135 entered service with the Strategic Air Command in 1957, supporting aircraft including the Boeing B-47 Stratojet and Boeing B-52 Stratofortress during continuous bomber alert operations associated with policies like Mutual Assured Destruction. During the Vietnam War, KC-135s deployed from bases such as Andersen Air Force Base and U-Tapao Royal Thai Navy Airfield to refuel fighters like the McDonnell Douglas F-4 Phantom II and reconnaissance platforms such as the Lockheed U-2. Throughout the Cold War, KC-135s participated in NATO exercises, supported Operation El Dorado Canyon, and sustained long-range deployments during Operation Desert Storm and Operation Allied Force. In the 21st century, KC-135s supported Operation Enduring Freedom and Operation Iraqi Freedom while cooperating with allies including the Royal Air Force, French Air Force, Royal Australian Air Force, and Japan Air Self-Defense Force during joint exercises like Red Flag and Exercise Cobra Gold.
Production KC-135A models were fitted with J57 turbojets and basic hose-and-drogue/boom refueling systems compatible with Boeing B-52 Stratofortress requirements, while KC-135E re-engining programs in the 1980s used CF6 engines salvaged from Douglas DC-10 aircraft. The KC-135R upgrade, driven by Boeing and General Electric, installed CFM56 high-bypass turbofans and updated avionics from contractors such as Honeywell and Rockwell Collins, improving range and payload and allowing operation alongside modern fighters like the F-15 Eagle and F/A-18 Hornet. Tanker Modular Mission Computer upgrades and the addition of aerial refueling boom improvements supported compatibility with NATO standardization treaties and procedures and enabled multi-point refueling concepts later realized by tankers such as the Airbus A330 MRTT.
Typical KC-135R specifications include a crew of three to four drawn from United States Air Force tanker squadrons, a fuel capacity enabling offload to receivers including Lockheed Martin F-35 Lightning II and Northrop Grumman B-2 Spirit, and a maximum takeoff weight that allowed operations from worldwide bases such as Ramstein Air Base and Al Udeid Air Base. Avionics suites integrated navigation systems interoperable with Global Positioning System satellites and datalinks used by assets like E-3 Sentry and E-8 Joint STARS. Structural modifications, wing anti-icing, and corrosion control programs preserved airframes exposed to operating environments at locations including Howard Air Force Base and Thule Air Base.
Primary operator throughout its history has been the United States Air Force, supported by units from the Air National Guard and Air Force Reserve Command stationed at bases such as Joint Base McGuire–Dix–Lakehurst, Joint Base Pearl Harbor–Hickam, and Scott Air Force Base. Allied operators and users have included training and operational integrations with the Royal Air Force, Canadian Forces, Royal Netherlands Air Force, and militaries participating in NATO operations, with interoperability established through agreements like the NATO Status of Forces Agreement.
KC-135s have been involved in peacetime accidents, mid-air collisions during refueling operations with aircraft such as the B-52 Stratofortress and F-4 Phantom II, and combat losses during conflicts including Vietnam War operations near Đà Nẵng Air Base. Notable incidents prompted investigations by the National Transportation Safety Board and Air Force Safety Center, leading to procedural changes, crew resource management training influenced by concepts used at US Naval Aviation institutions, and structural inspections overseen by Air Force Materiel Command.
The KC-135 established doctrines for modern aerial refueling used by successors like the Boeing KC-46 Pegasus and influenced designs such as the Airbus A330 MRTT, remaining an icon of United States Air Force power projection from the Cold War through contemporary expeditionary operations. Numerous airframes are preserved in museums including the National Museum of the United States Air Force, Pima Air & Space Museum, Royal Air Force Museum, and Smithsonian Institution, and commemorative displays honor crews from units like the 92nd Air Refueling Wing and 305th Air Mobility Wing. Its longevity informed procurement debates in the United States Congress and strategic reviews by the Department of Defense and allied defense ministries.
Category:United States military aircraft