Between 1962 and 1966, the procurement agency of the Swiss Armed Forces tested a piston engine powered PC-6 (S/N 530, serialled V-611), resulting in 12 units (V-612 through V-623) being introduced as from 1967. V-612 pictured here was manufactured in 1966 and the first of the initial batch. In 1980, all twelve were converted and equipped with the P&W PT-6 turboprop engine. A further six PC-6 Turbo Porters (V-630 through V-635) were added to the Swiss AF inventory in 1976. Having recently received an avionics upgrade, 14 remain in service at the time of upload, with no end in sight.