The F+W C-3605, nicknamed Schlepp ("Tug") or "Alpine Anteater", was a target towing aircraft operated by the Swiss Air Force from 1971–1987. The aircraft was developed during the latter half of the 1960s by the Swiss Federal Construction Works (Eidgenoessische Konstruktionswerkstaette) (EKW), renamed Farner Werke (F+W) in 1972, as a conversion of the existing C-3603 ground attack/target towing aircraft. Following a successful prototypeconversion in 1968, 23 aircraft were converted between 1971–1973 with 2 still flying in private hands.
The plane operated faithfully in the target towing role, exceeding its expected 10 year structural life. However, by the mid 1980s, the aging aircraft had begun to show signs of airframe fatigue. This led to the decision to retire the type from service in 1987 with the surviving aircraft being sold off and replaced by converted Pilatus PC-9s in the target-towing role.