The US Supreme Court has voted in favour of a policy banning certain transgender people from serving in the military.
The policy, proposed by President Donald Trump, will prohibit those who "require or have undergone gender transition" from serving.
This means individuals with a history of gender dysphoria will not be allowed in the military, but exceptions will be made for those who are willing to serve in their biological sex, according to former Defence Secretary Jim Mattis.
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The Supreme Court voted 5-4 to grant a request from the Trump administration to lift injunctions blocking the policy.
Four judges in the court opposed the ruling.
The move goes against a policy brought in by the Obama administration, which stated that transgender people could serve in the military and obtain funding to undergo gender reassignment surgery.
In 2017, Donald Trump announced on Twitter that the country would no longer "accept or allow" transgender people in the military because of "tremendous medical costs and disruption".
According to figures from the Department of Defence, there are around 8,980 active duty transgender troops.