[van der Merwe]

Hello, I was wondering if any of you out there would happen to know how callsigns/call numbers work. What I mean by this is, how do they vary between operational unit types (flights, squadrons, wings) and what does your callsign/call number say about your position within your unit. Even if you could just give me the title of a publication or a website that explains that kind of thing it would be greatly appreciated!