Today's featured aircraft by Dicksbro is mislabelled. There was no such thing as the Halberstadt CL-I. Instead, the aircraft illustrated is the widely-successful CL-II.

The confusion comes from the Luftstreitkräfte's designation system during the First World War.

At the beginning of the war, the system was quite simple: A for monoplanes, B for biplanes. (And this was at a time when the LSK didn't, as such, exist yet; it was still called IdFlieg, Inspektion der Fliegertruppen) Later, when people started arming aircraft, the Germans decided that category C aircraft would be two-seat, armed general-purpose aircraft.

The the IdFlieg/LSK decided to start doing a more or less mnemonic, rather than strict alphabetic system: D, Doppeldecker (biplane); E, Eindecker (monoplane); Dr, Dreidecker, (triplane: all D, Dr, & E also imply single-seat aircraft); G Grossfleugzug, large aircraft, multi-engine bombers, (originally K, Kampffleugzug, "Battle aircraft); R, Reisenfleugzug, giant aircraft, some even larger than many WW II bombers; J, apparently a throw-back to the alphabetical system, armored ground-attack aircraft.

And then the more specialized aircraft:
N, Nacht, (night) aircraft specially designed for night operations);
CN, night-adapted C aircraft, later simply N;
DJ, single-seat aircraft adapted fr ground attack;
CL & GL: CL is, of course, the class to which the featured aircraft belongs. The addition "L" implies "Licht" (light): lightweight versions of C or G aircraft. In the case of C aircraft, the original purpose was to produce a two-seat escort fighter. They could also carry a few light bombs, and when ground strafing & close air support became part of their regular duties, grenade racks were added to their regular equipment.

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