hi guys i was LPR, and i become us citizen in april 30, at the time i sent my certificate of naturalization i sent together form g38 which is almost the same thing than ds3230 that save some time and it works pretty good. another tip is that you can sent both forms i-864 and ds-230 at the same time and nvc will process ds-230 the same day they received and i-864 affidavit of support a week later.