Armed Forces Transgender Dependent Protection Act This bill expands the policy of the Office of Special Needs within the Department of Defense to address transgender dependents. Specifically, the bill codifies the definition of a medical or educational special need to include gender dysphoria. Under the bill, the policy of the office must prohibit the assignment of a military family with special needs to a permanent duty location where the law restricts medically necessary treatment for a medical or educational special need. A member who is serving at a location when such a law is established may elect to be reassigned.