 At the time of the war's conclusion, the Swiss Air Force was equipped with numerous piston-engined aircraft, while several high-ranking officials sought to adopt new designs that harnessed newly-developed jet propulsion instead.During the same time period, Swiss defense companies also sought to develop increasingly capable equipment, including Eidgenössische Flugzeugwerke Emmen's EFW N-20, which would be Switzerland's first domestically-designed and manufactured jet fighter.According to author Fiona Lombardi, development of the N-20 was greatly hindered by a lack of technical knowledge and over-ambitious performance demands, which contributed to a protracted development programme.