An odd find. WW2 based rpgs aren't common, and Fasa is a classic so I had to pick this up. First book somewhat affected by mould, but the staples in surprisingly good condition.
@AndreasDavour Where did you buy the game?
@mrundkvist I found it on Tradera for a reasonable price.
@AndreasDavour The big military RPG when we were kids was Twilight 2000 (1984), and this one's just two years older.
@mrundkvist yeah, I think T2k is the one most people know of. There was a WW2 line for GURPS 3 as well, but then there's precious few military RPGs.
Behind Enemy Lines won "Best RPG Rules" at Origins but has never been re-issued. And get this, haha, a much-read 1990 book rates it as "Not as good as Phoenix Command!" 
@mrundkvist That comparison I had not seen before! But, the early nineties was one of the eras where "realism" was popular, so maybe that's a statement of that time.
Having looked at the rules quite quickly, it looks to be reasonably playable. That's *better* than PC, I think.
I believe the consensus opinion today is that Phoenix Commend wasn't even really an RPG, it was a pen-and-paper ballistics simulator.
From what I'm reading here, BEL seems to include a minis battle system. Let's remember that D&D 1.0 had been published only 8 years previously with the box top proclaiming that it was a minis wargame.