Lockheed C-130 Hercules C-130A

The C-130A was the first production model of the Hercules and directly inherited the configuration of the two YC-130 prototypes, including the distinctive blunt nose without the prominent weather radar that would characterize later versions. It was powered by four Allison T56-A-9 turboprops (T56-A-11 on the earliest aircraft) driving three-bladed propellers, a configuration unique to this model before the B and E variants adopted more powerful engines.

The United States Air Force ordered 219 C-130As, with initial deliveries to Tactical Air Command beginning in December 1956 and continuing until 1959, when the C-130B entered production. Soon after entering operational service, Tactical Air Command units found the aircraft's range insufficient for its intended tactical airlift missions. To address this, Lockheed added extra fuel tanks in pylons mounted under the wing, outboard of the engines, which provided 2,700 kg (6,000 lb) of additional fuel and raised total capacity to 18,000 kg (40,000 lb).

Some C-130As were fitted with retractable skis for operation on snow and ice, becoming the redesignated C-130D, used to support Distant Early Warning Line radar stations in Greenland and later in Antarctic operations under Project Deep Freeze. Other C-130As served as the basis for later specialized conversions, including electronic-warfare and gunship aircraft — the AC-130 prototype was itself converted in 1967 from a JC-130A — underscoring the C-130A's role as the original platform from which much of the later Hercules variant family descended.

The C-130A shared front-line USAF service with the B and E models for years, before being progressively replaced and withdrawn from the early 1970s onward, though some exported aircraft continued flying with foreign air forces for decades.