Admittedly, I haven't made this thread, but it doesn't seem to be that hard to guess, that meaning of the tag [Poland] is similiar to [EU] or [NA] (i.e. the target area of recruitment). Futhermore, I don't see why you related it with the phrase "polish army", because I noticed that it appears for the very first time in your post
Hopefully, I succeed to help you with decifering this puzzle.