The Swiss AF started to evaluate a new interceptor in 1973, in order to replace the ageing Hunter fleet. During the spring session of the parliment, the procurement of 66 F-5E single-seater and 6 trainer was approved. During 1978, the frist 19 aircraft (13 F-5E and all 6 F-5F) were transported to Switzerland on board of C-5 Galaxy of the USAF. All remaining 43 aircraft were then assembled at the Aircraft Factory at Emmen.
The F-5 proved to meet all criterias very well, and so the Swiss Air Force procured another batch in 1979, which consisted of 32 single- and 6 dual-seater. All but one aircraft (J-3067) were built at Emmen.
Additional information on the F-5E/F Tiger II aircraft in use with the Swiss Air Force can be found here: