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.

In 1967 the Swiss Air Force determined that their C-3603-1 target-towing aircraft still had approximately 10 years of structural life remaining, but that the plane's Hispano-Suiza piston type engines were on the verge of wearing out, with replacements becoming scarce.

This was much lighter than the piston engine of the C-3603 and so the conversion included an extension of the nose of the aircraft by 1.82 metres (6.0 ft) to maintain the center of gravity.

[4] Whilst in the service of the Swiss Air Force the C-3605s were usually painted in conspicuous yellow-and-black striped, high-visibility colour schemes.

[5] 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.