In a month I will have lived in the US for one year as PR. My company is sending me to do some work for them overseas. 1. Do I have to eligible for naturalization FIRST before I file N-470? Or is this just for any LP who have lived in the US for an uninterrupted year? 2. Can I file it while I am overseas? 3. Can I file when I come back having lived outside the US for less than a Year? 4. Can I file the application and leave BEFORE I hear back from USCIS? 5. What should my employer write in the supporting documents? 6. What makes my company an American corporation/firm?
1. No, you do not have to be eligible for naturalization.
2. No, you have to file while in USA.
5 and 6 require a lawyer to look over your company's details.