This may be at full difficulty offline, Damocles. That's why there is a big k/d ratio. You are dead, you press "repeat mission" button
Another "option" would be to set an own, pass-protected server with some coop missions installed. Once you know how to fight with AI, you can earn lots of online points without being interrupted by the "real" players

OT:
As for the Polish presence in the war, you speak perhaps about the WW2. During the Great War the Poles flew in Russian, Austro-Hungarian and German air units. Few flew in the French squadrons.
br,
Lucas