C-3605 was a target towing aircraft operated by the Swiss Air Force from 1971 to 1987. It has been developed in the 60’s as a conversion of C-3603 by the Swiss Federal Construction Works (Eidg. Konstruktionswerkstätte) renamed F+W. The first prototype conversion has been successfully completed in 1968 and 23 aircraft has been converted from 1971 to 1973. Only two of them are still flying and are privately owned.