Hello, I am kind of new on this forum even though I have been reading most of this post. I recently received the 212.a.3.b. thing too after placing an inquiry call, anywhere, to comment of the issue of travelling with a RTD,I also had that question in mind, what I did was I went and ask my Senator to do an official inquiry for me, with my information including RTD number, A number and receipt number, which I have a responds in writing directly from Immigration congressional Service, so I would advise anyone in doubt to contact his/her congressman, it’s a free service, why not do it and get real answers rather than guess work from this forum.