The Selective Service System considers the term "male" in the federal law to refer to the sex observed at birth, so trans women are required to register, while trans men are not. Failure to register can cause problems such as denial of Pell Grants, even when registration would not have been allowed. As of 2019, the policy toward allowing service of transgender personnel in the United States military is its own subject of legal dispute. If upheld, under the ban ordered by President Donald Trump, trans women who were required to register with the Selective Service System would not be allowed to serve in the military if drafted or volunteering.