the "D" class). In late 1918 the last "E" type, the Fokker E.V was redesignated the "D.VIII", and other late war monoplane types (such as the Junkers CL.I) were also designated in their "functional" class, in line with the abandonment of designations based on wing layout. F Single-seat armed triplane (designation used briefly in 1917). Applied only to the Fokker F.I, which was redesignated the "Dr.I" by the time it went into production. G Armed twin-engined biplane bomber aircraft, originally bore the "K" (Kampfflugzeug - "battle aircraft", see below) designation at the war's start, became "G" (Großflugzeug - "large aircraft") in 1915. GL Faster twin-engined aircraft suitable for use as day-bombers or for long range reconnaissance (designation introduced in 1918). Bore a similar relationship to the "G" as the "CL" bore to the "C". Weight and wing span were reduced, and crew was limited to two – the forward gunner’s cockpit being eliminated. J Armoured dual-role liaison aircraft and ground attack aircraft (designation introduced in 1917). Most examples resembled "C" types in general layout – differing only in being fitted with armour to reduce vulnerability to ground fire. The exception to this was the Junkers J.I, designed specifically as an armoured aircraft. K Armed biplane bomber aircraft with two or three engines (Kampfflugzeug–"battle aircraft"). Designation introduced early in 1915, and replaced by "G" later that year. (see "G" types above) L Heavy bomber mid way between G and R classes. Applied only to the Siemens-Schuckert L.I, which never saw operational service. N Two-seat single engined night (Nacht) bomber. Basically a "C" type aircraft with longer wing span to enable a heavier war-load. Designation introduced in 1918, superseding "CN" specification. R Large bomber aircraft with at least three, in some cases up to six engines (Riesenflugzeug–"giant aircraft"). An important distinguishing feature from the "G" class (apart from size) was that all engines should be accessible in flight to permit running repairs. Post war The system ceased to apply with the end of German military aviation following the Armistice; in the nineteen twenties and thirties, although the Fokker company gave its new military types "Idflieg" style numbers, to continue war-time sequences. Fokker two seat military reconnaissance aircraft continued the wartime "C" series and Fokker single-seater fighters were given numbers in the "D" series to exploit the reputation of the wartime D.VII. Aircraft of the Luftwaffe were named according to the RLM aircraft