USAF - United States Air Force - RF-42. In addition, the 421st Tactical Fighter Squadron was reassigned from Takhli Royal Thai Air Force Base. During Operation Linebacker, between May and October 1972, the 432d TRW had seven F-4 tactical fighter squadrons assigned or attached, (13th, 56th, 308th, 414th, 421st, 523d and 555th) making it the largest wing in the USAF.
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