No, it's a system I devised for 4.10. I wanted to give players without the in-depth historical knowledge (in this case I'm one of them) at least a bit of hint what types these units flew in WW2. I wanted to use the term "Strike" but that proved to be too long for the drop-down list.
It's not meant to demonstrate what kind of operations these units flew since that goes far beyond the scope of such a system. I could easily remove all (F), (FB), (TB), (B) and (T) from the list but then a not-so-informed player doesn't know what this or that unit did in WW2. Most thoughtless of the RAF and its sister air forces not to include some kind of hint as to what a squadron did. Couldn't they have taken a hint and done it like the Luftwaffe or the VVS?
EDIT: I left out the night-bomber units on purpose since there are no aircraft for them in the game so far. I had to draw a line WRT workload somewhere. Sorry.