So, what exactly is "JFV"?

[Nick Beale]

If you take a look at the sub-forums under the 12 o’clock high “Books and Magazines” section, you’ll see one headed “Die Jagdfliegerverbände der Deutschen Luftwaffe 1934–1945” and that’s what everyone’s on about — a monumental undertaking by Jochen Prien.

Jagdfliegerverbände (=fighter units) gets shortened to JFV, i.e. the initial letters of the three words which make up the compound noun (which are a big feature of German).

The whole series is broken into numbered volumes (e.g. on a theatre of operations or timeframe) and some of those volumes take up more than book.

So: Band (plural Bände) = a volume which may consist of several parts or Teile (singular Teil).