You were abandon by your husband while you were serving in the army It has been 4 years since you last saw him In this situation can you use his last know address to file for divorce or do you have to?
If you truly do not know hwere he is, I'm sure you can get information from his Social Security Number about his whereabouts. He has to work! There are services for this information on the internet. Do a search on "finding a person with only a social security number. Good Luck.