I've tried to read all 148 pages of this thread but may well have missed it. I'm a GE newbie -- have had my interview, rehersed with the practice kiosk, and received the wallet card with the RFID chip, so apparently everything is now live. What I'm trying to understand is, other than ground travel returning from Canada/Mexico, do I ever actually need the wallet card? The documentation that comes with it is vague on this point. I had assumed all that is need for use of the kiosk for an air arrival into the US was a passport, and the wallet card stays home unless you are making a surface return to the US -- is this right?