Polish law apparently calls for sentences of up to 5 years in prison if a Polish citizen willingly joins a foreign military without permission.
No, you don't understand the text. It says 5 years in prison if you put on a uniform of a foreign country without permission, and then fight for that country in another uniform
If you have your greencard, it's just a matter of time before you get your citizenship,
Not if it's a 2 year "conditional" green card which is based on marriage.
you have to be a permanent resident for a certain number of years before you can apply for citizenship, I don't remember if it's three or five.
5 years if not married, 3 years if married to US citizen.
I guess its a good deal for the US, but for the Poles? I dont think so...
Really? If so why are there visas for Poland?