US troops in Afghanistan (Picture: DVIDS).
A new Pentagon directive has set out that transgender troops serving in the US military will largely be barred from transitioning to another sex.
The new policy will also require most individuals to serve in the gender assigned to them at birth.
Personnel with gender dysphoria will no longer be allowed medical surgeries for transitioning, unless they start the process before the implementation of the new rules on 12 April, or exempt.
The policy outlines service members will be expected to dress to the standards of their biological gender.
It does, however, fall short of the total ban initially called for by President Donald Trump in 2017, and will come into effect after a 30-day window.
In 2017, Mr Trump announced on Twitter that the US would no longer be "burdened" with the costs of recruiting transgender men and women.
Mr. Trump said at the time: "Our military must be focused on decisive and overwhelming victory and cannot be burdened with the tremendous medical costs and disruption that transgender in the military would entail."
Some US military officials will be given the power to waive the policy for use of showers, bathrooms and other physical standards, depending on the circumstances of each case.
The US Deputy Defense Secretary, David L. Norquist, signed the memo on the policy.