I have an interview, scheduled a day before I reach full three years of permanent residency (based on marriage). My DO is Washington D.C./Fairfax, where I read here and elsewhere that the interview and the oath are usually done on the same day. Does that mean that I wont be able to take the oath the same day, granted I pass the interview? Also, on what days can the oath be taken in Fairfax office? Anybody else has a similar experience?