digit identifies the aircraft type. The next three are the sub-type and individual aircraft, with the first and sometimes second for the subtype; and the third and sometimes fourth for the individual aircraft, In the following examples, "x" identifies the individual aircraft: Mirage IIIBS = J-200x Mirage IIIDS = J-201x Mirage IIIRS = R-21xx Mirage IIIC = J-22xx Mirage IIIS = J-23xx F-5E = J-30xx (serials previously used for the FFA P-16) F-5F = J-32xx F/A-18C = J-50xx F/A-18D = J-52xx 3 digit numbers Most aircraft have three numbers. These follow a broadly similar pattern to the four-digit numbers, although there are exceptions. Transport aircraft have a first digit of 3 for helicopters and 7 for fixed wing aircraft. 2 digit numbers Target drones have only two numbers. Radio callsigns Bambini-Code – a tactical radio code used from the 1940s to the 1990s Notes and references Bibliography Force Report: Swiss Air Force, Air Forces Monthly magazine in association with Air Forces Intelligence – The Online Air Arms Database, September 2009 issue. Roman Schürmann: Helvetische Jäger. Dramen und Skandale am Militärhimmel. Rotpunktverlag, Zürich 2009, . . External links Swiss air force official website Axalp live firing ex 2018 All Swiss armed forces facilities at the Zone Interdite website Last Hunter Sq 2 ops Ulrichen airbase 1990 part1 Last ops Ulrichen airbase 1990 part2 Former flight ops Hunter Sq 2 at Ambri airbase 1989 Last Ambri cavern flight ops 1992 Payerne airbase info Locarno airfield info Reactivation exercise Buochs airfield 2014 Military units and formations established in 1914 1914 establishments in Switzerland