Operation Spring High was a costly, fatal mission with last-minute changes, wrong tactics, improper ordnance, and a high loss of aircraft and airmen. Of the 46 F-105s that attacked the two SAM sites, six aircraft were lost with three pilots killed, two captured, and one rescued.
Speed & Angels Productions released the long-awaited follow-up to their 2018 award-winning documentary, Thud Pilots.
Drawing inspiration from the celebrated book Thud Pilot by distinguished F-105 aviator Vic Vizcarra, Thud Pilots II continues the story of Vietnam War’s most iconic fighter aircraft. The sequel brings together firsthand accounts from pilots who persevered despite being constrained by frustrating target restrictions and rules of engagement. The film also chronicles the rise of the Hunter Killer mission, drawing on material from Vizcarra’s book.
On March 2, 1965, the Johnson Administration launched “Rolling Thunder,” a phased bombing campaign against North Vietnam aimed at preventing the communist regime from overthrowing the South Vietnamese government. From the outset, a 10-mile exclusion zone was established around Hanoi, later expanded to a 30-mile restricted area under direct White House control.
On July 27, 1965, 48 F-105D Thunderchiefs—known as “Thuds” by their crews—were tasked with striking two Surface-to-Air Missile (SAM) sites in retaliation for the war’s first SAM shootdown three days earlier, when an F-4C was downed. What the crews didn’t know was that behind the scenes, a heated debate had been underway at the White House since the SAM sites were first identified on April 5, 1965 — just 34 days after Rolling Thunder began. The CIA and Joint Chiefs of Staff (JCS) had urgently recommended destroying the sites before they became operational, but Secretary of Defense Robert McNamara pushed back, persuading President Johnson to place them on an ever-growing list of off-limits targets. As construction progressed, the JCS submitted three separate recommendations to strike—all of which were overruled, largely out of concern over provoking North Vietnam’s backers, the Soviet Union and Communist China. This restraint came at a cost, as American pilots flying missions over the North continued to be lost.
The first SAM shootdown finally forced a White House reassessment, though McNamara still resisted striking all the sites, fearing escalation. The debate continued right up until the day of the retaliatory strike. Two days after the shootdown, the JCS prevailed, and President Johnson authorized the attack, reportedly saying he wanted to “take them out.” The mission was assigned to F-105 pilots based at Takhli and Korat in Thailand.
The North Vietnamese, however, anticipated the strike. Their early warning radars tracked the incoming aircraft until the planes descended into ground clutter about 14 miles out. While the extremely low-altitude approach did limit the effectiveness of some enemy gun emplacements—whose protective berms prevented sufficient depression of the barrels—North Vietnamese forces still managed to put up a fierce anti-aircraft barrage, shooting down three F-105s in the first 19 minutes. A fourth was lost 48 minutes later. Attacks on SAM Site 7 lasted nearly 30 minutes, with six flights pressing in at low level using napalm and cluster munitions. More than half the attacking aircraft returned with battle damage.
Operation Spring High proved to be a costly failure, marred by last-minute changes, flawed tactics, inappropriate ordnance, and heavy losses. Of the 46 F-105s that attacked the two sites, six were lost—three pilots killed, two captured, and one rescued. The mission was a clear tactical victory for the North Vietnamese, who had anticipated retaliation from the moment they successfully employed a SAM. Within 24 hours, they had cleared both launch sites and converted them into flak traps, surrounding them with 130 anti-aircraft guns. Pre-mission reconnaissance photos had already shown what appeared to be decoy missiles — bamboo poles lashed together and painted white to resemble SA-2s. The JCS recommended canceling the mission, but McNamara overruled them, arguing that too much planning had already gone into it and that it was important to project American resolve. Post-war documentation from North Vietnamese Air Defense archives confirmed that the initial SAM firing had been part of a deliberate trap designed to lure in and devastate a large American strike package.
Despite the disastrous outcome, the mission was not without consequence. The SAM shootdown of the F-4C and the Spring High debacle together spurred the creation of an Air Staff Anti-SAM Task Force, led by Brigadier General Kenneth “KC” Dempster and involving the Air Force, Navy, and defense contractors. The Task Force abandoned conventional bureaucratic procedures in favor of streamlined, trust-based practices. In one notable case, a $6.7 million program was initiated on the strength of a handshake and a Polaroid photo of an agreement written on a blackboard. Within five months of Spring High, the first Radar Homing and Warning (RHAW) receivers were installed in F-105s at Takhli—and within three months of the Task Force receiving its mandate. The concept for a dedicated anti-SAM aircraft also emerged from this effort, resulting in the first Wild Weasels. The initial modified F-100Fs arrived at Korat on November 25, 1965, and scored their first SAM site kill on December 22 of the same year. QRC-160 jamming pods began arriving in the theater by September 1966.
The Air Force adopted all 47 solutions proposed by the Task Force. The impact was substantial: even as confirmed SAM sites grew to 18 — with another 18 suspected — strike operations continued and intensified, while SAM kill effectiveness dropped from 5.7% in 1965 to 2.8% in 1966, eventually falling to just 1.15% by war’s end.
For Vic Vizcarra, Spring High was his seventh mission of that tour. Having already flown combat, he was growing accustomed to being under fire—but he described Spring High as the most intense mission he had flown to that point, even though tight formation flying during the attack phase prevented him from directly observing the anti-aircraft fire. What stayed with him were the distress calls and emergency beepers heard over the radio. He also expressed sympathy for a fellow pilot who had been slotted in as a spare at the last minute, filling in when a mission member aborted—only to find himself flying into a flak trap on what turned out to be his very first combat mission.
Col. (Ret.) Vic Vizcarra logged 3,590 total flying hours over a 24-year Air Force career. A Vietnam combat veteran, he flew 179 missions in Southeast Asia across several iconic fighter aircraft.
