F-100F 58-1221, 6234th Tactical Fighter Wing, Korat RTAFB, Thailand - F-100F-20-NA 58-1221 was the first of the original four two-seat Super Sabres converted as a Wild Weasel I to counter the threat from North Vietnam’s SA-2 Guideline surface-to-air missiles. It was modified for the role at North American’s facility at Palmdale in California. The aircraft was equipped with an AN/APR-25 radar homing and warning receiver, mounted in a modified tail antenna, to detect the fire control radar used by the missile sites. The threat signal from the system was displayed on a 3in (7.6cm) cathode-ray tube in the cockpit. The IR-133 did a similar job, but had a greater detection range, while the AN/APR-26 launch warning receiver could detect the change in power of the Fan Song guidance radar that indicated a launch, illuminating a red light in the cockpit. A KA-50 panoramic strike camera was used to photograph the missile sites and post-attack damage, while enemy radar signals were recorded on a dual-track tape for later analysis. Flight testing of the four aircraft took place at Eglin AFB in Florida from 4 September 1965 and the first arrived at Korat RTAFB on 25 November. They were assigned to the 6234th Tactical Fighter Wing (TFW), under the operational control of the 388th TFW. Two of the seven Wild Weasel Super Sabres were lost in combat, including 58-1221, which was downed by anti-aircraft artillery on 13 March 1966.