Procurement started in 1946 with an initial batch of four aircraft (serialled J-1001 to J-1004). The positive experiences with this first jet-fighter lead to the purchase of 75 DH-100 Mk.6 aircraft with deliveries starting in spring 1949. These aircraft replaced the Me 109E and D-3800/D-3801 in the frontline units. Even before all aircraft were delivered from Switzerland showed interest in a licence production of no less than 100 additional aircraft. In order to facilitate the conversion to this jet a total of forty Vampire-Trainer (DH-115 Mk 55) was procured between 1953 and 1967.
Part of the fleet was withdrawn from use in 1961 and 1968. Those aircraft remaining in service were equipped with ejection seats and eventually received IFR equipment.
Additional information on the Vampire aircraft in use with the Swiss Air Force can be found here: