What does it mean that I can self-select my preferred gender during the TWIC® application process?

You can select gender on your TWIC® application that is most appropriate for you - Male, Female, or Another Gender.  The gender on your identification document does not have to match the gender you select on your TWIC® application.   Medical certification or a physician's letter is not required when enrolling with a gender that does not match the gender on your identification documents.