C-130A Model

The first production C-130s were designated as A-models, with deliveries to the 463rd Troop Carrier Wing at Ardmore AFB, Oklahoma and the 314th Troop Carrier Wing at Sewart AFB, Tennessee. Six additional squadrons were assigned to the 322nd Air Division in Europe and the 315th Air Division in the Far East. Additional airplanes were modified for electronics intelligence work and assigned to Rhine-Main Air Base, Germany while modified RC-130As were assigned to the Military Air Transport Service photo-mapping division. Airplanes equipped with giant skis were designated as C-130Ds, but were essentially A-models except for the conversion. As the C-130A became operational with Tactical Air Command, the airplane's lack of range became apparent and additional fuel capacity was added in the form of external pylon-mounted tanks at the end of the wings. The A-model continued in service through the Vietnam War, where the airplanes assigned to the four squadrons at Naha AB, Okinawa and one at Tachikawa AB, Japan performed yeoman's service, including operating highly classified special operations missions such as the BLIND BAT FAC/Flare mission and FACT SHEET leaflet mission over Laos and North Vietnam.

C-130B Model

The C-130B model was developed to complement the A-models that had previously been delivered,and incorporated new features, particularly increased fuel capacity in the form of auxiliary tanks built into the center wing section and an AC electrical system. Four-bladed Hartzell propellers replaced the Aero Product three-bladed propellers that distinguished the earlier A-models. B-models replaced A-models in the 314th and 463rd Troop Carrier Wings. During the Vietnam War four squadrons assigned to the 463rd Troop Carrier/Tactical Airlift Wing based at Clark and Mactan Air Fields in the Philippines were used primarily for tactical airlift operations in South Vietnam. In the spring of 1969 463rd crews commenced COMMANDO VAULT bombing missions dropping M-121 10,000 pound bombs to clear "instant LZs" for helicopters. As the Vietnam War wound down, the 463rd B-models and A-models of the 374th Tactical Airlift Wing were transferred back to the United States where most were assigned to Air Force Reserve and Air National Guard units. Another prominent role for the B-model was with the United States Marine Corps, where Hercules designated as GV-1s replaced C-119s. After Air Force C-130Ds proved the type's usefulness in Antarctica, the US Navy purchased a number of B-models equipped with skis.

C-130E model

The extended range C-130E model entered service in 1962 after it developed as an interim long-range transport for the Military Air Transport Service. Essentially a B-model, the new designation was the result of the installation of 5,150 liter (1,360 US gallon) fuel tanks under each wing. (center-section) wing-mounted auxiliary fuel tanks and more powerful Allison T-56-A-7A turboprops. The E model also featured structural improvements, avionics upgrades and a higher gross weight.

The KC-130 tankers, originally C-130Fs procured for the US Marine Corps (USMC) in 1958 (under the designation GV-1) are equipped with a removable 13,626 liter (3600 US gallon) stainless steel fuel tank carried inside the cargo compartment. The two wing-mounted hose and drogue aerial refueling pods each transfer up to 19 liters per second (equivalent to 300 US gallons per minute) to two aircraft simultaneously, allowing for rapid cycle times of multiple-receiver aircraft formations, (a typical tanker formation of four aircraft in less than 30 minutes). The US Navy's C-130G has increased structural strength allowing higher gross weight operation.

C-130H model

The C-130H model has updated Allison T56-A-15 turboprops, a redesigned outer wing, updated avionics and other minor improvements. Later H models had a new, fatigue-life-improved, center wing that was retro-fitted to many earlier H-models. The H model remains in widespread use with the US Air Force (USAF) and many foreign air forces. Initial deliveries began in 1964 (to the RNZAF), remaining in production until 1996. An improved C-130H was introduced in 1974.

From 1992 to 1996 the C-130H was described as a C-130H3 by the USAF. The 3 denoting the third variation in design for the H series. Improvements included a partial glass cockpit (ADI and HSI instruments), a more capable APN-241 color radar, night vision device compatible instrument lighting and an improved electrical system using Bus Switching Units to provide 'clean' power to the more sensitive upgraded components.

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