Passage: On 5 April 1965, U.S. reconnaissance discovered that the North Vietnamese were constructing positions for what could only be surface-to-air missile (SAM) batteries. The air force and navy then filed a joint appeal to Washington for permission to strike the sites, but they were refused since most of the sites were near the restricted urban areas. Then, on 24 July, an F-4 was shot down by a SA-2 Guideline missile. Three days later, a one-time strike was authorized against the two offending missile sites. The Americans, however, fell for an elaborate trap when the sites turned out to be dummies surrounded by anti-aircraft artillery defenses. One American pilot described the action which followed as "looking like the end of the world." Six of the strike craft were destroyed (two of the pilots were killed, one missing, two captured, and one rescued) during the ambush.On 29 June 1965, airstrikes against the North's petroleum, oil, and lubricants (POL) storage areas were authorized by Johnson. The American military had advocated such strikes since the inception of the operation, believing that to deny North Vietnam its POL would cause its military effort to grind to a halt. At first, the strikes appeared highly successful, destroying tank farms near Hanoi and Haiphong and leading the Central Intelligence Agency (CIA) to estimate that 70 percent of North Vietnam's oil facilities had been destroyed for the loss of 43 aircraft. The loss of the oil storage tank farms and refineries proved to be only a short-term inconvenience for North Vietnam, however, since Hanoi had anticipated just such a campaign and had during that time dispersed the majority of its POL stocks in 50-gallon drums across the length of the country. The POL attacks were halted on 4 September, after U.S. intelligence admitted that there was "no evidence yet of any shortages of POL in North Vietnam."By 24 December 1965, 170 U.S. aircraft had been lost during the campaign (85 Air Force, 94 Navy, and one Marine Corps). Eight VNAF aircraft had also been...

Question: What was used to shoot down US's recon F-4 in North Vietnam?
SA-2 Guideline missile