Transgender people and military service
On 12 March 2019, acting Deputy Defense Secretary David Norquist signed a directive to allow Trump's policy to take effect in 30 days.

Joe Biden administration: On Biden's first day in office, his press secretary, Jen Psaki, announced in a press conference that the President would soon reverse the government's ban on transgender people from serving openly in the military, though a specific date for this action was not announced. Although Biden had originally said that reversing the ban would be an action taken "on day one", this had been unable to happen due to the fact that his nominee for Secretary of Defense, Lloyd Austin, had still not been confirmed yet.
On 25 January 2021, President Biden signed an executive order to reverse the ban, allowing most transgender individuals to serve in the United States military. The order also required the United States Department of Homeland Security to lift its transgender service ban as well. The order immediately revoked both The Presidential Memorandum of March 23, 2018 (Military Service by Transgender Individuals) and the Presidential Memorandum of August 25, 2017 (Military Service by Transgender Individuals), and also requires the Secretary of Defense and the Secretary of Homeland Security, with respect to the Coast Guard, holds consultation with the Joint Chiefs of Staff to determine how to best implement a full reversal. Biden's order prohibited any service member from being forced out of the military on the basis of gender identity. On April 30, 2021, the Pentagon enacted a new policy which called for better medical service access and gender marker assistance to transgender people in the United States military.

See also: Sexual orientation and military service

References: 

External links: Palm Center: Blueprints for Sound Public Policy
LGBTInclusion The Hague Centre for Strategic Studies
SPARTA A Transgender Military Advocacy Organization