The HORRORS of the AC-130 Spectre — Why the NVA Feared It

September 21st, 1967. Nha Trang Air Base, South Vietnam. A modified C-130 Hercules transport, prototype tail number 54-1626, rolled onto the ramp for a ninety-day combat evaluation. Six days later it flew its first mission. On November 9th it killed its first truck on the Ho Chi Minh Trail. By the end of the war the gunship lineage it started would be credited with more than ten thousand trucks destroyed. Six of its airframes would be shot down. Fifty-two of its crewmen would die over Laos, Cambodia, and South Vietnam. The F-4 Phantom pilots tasked with escorting it called it the Fabulous Four-engine Fighter. The North Vietnamese truck drivers running supplies south through the jungle canopy gave it a different name. In their reports it appeared as the Evil Bird. The PAVN 377 Air Division's own internal history put the point more plainly. An hour without an AC-130 over their chokepoints, the history records, was both precious and rare. The AC-47 Spooky came first. A converted C-47 Skytrain with three 7.62mm miniguns hanging out its left side, flown in pylon turns over Viet Cong positions, raining ammunition in arcs visible from miles away. The crews swore by it. The hamlets it defended were never overrun while it was overhead. But the war was changing. The fight was shifting north and west into Laos, where supplies moved at night under triple-canopy jungle, where the AC-47 was too small, too slow, and too lightly armed. Captain Ronald W. Terry, the architect of the AC-47, proposed the answer. A bigger airframe. The C-130 Hercules. More fuel. More guns. Better sensors. He called the project Gunboat. The Air Force renamed it Gunship II. The crews who flew it took the call sign that stuck. Spectre. The prototype was a JC-130A test aircraft. Firing ports were cut along the left side of the fuselage. Four 7.62mm Gatling guns and four M61 Vulcan 20mm rotary cannons were bolted in along the cuts. A Starlight scope, a side-looking radar, an early forward-looking infrared, and a computerized fire control system that fed sensor data directly to the guns were installed. The analog fire control computer was hand-built at the USAF Avionics Laboratory at Wright-Patterson by an officer named Tom Pinkerton. The fuel tanks were inerted against ground fire.