As an aside the green waiver form has to be the worst designed form I have ever seen! Have you ever tried filling it in with after a 12 hour journey with jet lag and a leaky biro? The immigration staff are unforgiving and are constantly sending people to the back of the line. A tip: remember to fill in BOTH sides of the form and sign where requested. A second tip: read the entire form first and note the the name of the field is ABOVE the field. This way you wont enter the DOB in a blank space.