"Beginning June 10, when a passport applicant presents a certification from an attending medical physician that the applicant has undergone appropriate clinical treatment for gender transition, the passport will reflect the new gender. The guidelines include detailed information about what information the certification must include. It is also possible to obtain a limited-validity passport if the physician's statement shows the applicant is in the process of gender transition. No additional medical records are required. Sexual reassignment surgery is no longer a prerequisite for passport issuance. A Consular Report of Birth Abroad can also be amended with the new gender.
"As with all passport applicants, passport issuing officers at embassies and consulates abroad and domestic passport agencies and centers will only ask appropriate questions to obtain information necessary to determine citizenship and identity."
-- New memo from the US State Department outlining a new policy on gender change in passports