WASHINGTON>> The military services scrambled Friday to nail down details and put together new guidance to start removing transgender troops from the force.

Defense Secretary Pete Hegseth, in a memo released late Thursday, reinstated orders issued earlier this year that said “expressing a false gender identity divergent from an individual’s sex cannot satisfy the rigorous standards necessary for military service.”

His new order gives active duty troops until June 6 to identify themselves as transgender and voluntarily begin to leave the service. National Guard and Reserve troops have until July 7.

Army Maj. Alivia Stehlik, who served in the infantry and is now a physical therapist, will be eligible to retire in three years but doesn’t want to be forced out for being a transgender service member.

“I still have a job to do,” she said. “My command expects me to show up and be an officer and do my job because I’m the only person at my unit who can do what I do.”

The military services were rushing to put out new guidance to help commanders work through the process, including what to do in more complex situations, such as if any of the troops are deployed, at sea or may require special orders or funding to meet the deadlines.

In 2015, then-Defense Secretary Ash Carter broached the idea of lifting the ban on transgender troops and allowing them to serve openly, which raised concerns among military leaders. He set up a study, and in June 2016 announced the ban was over.

Reinstating that ban has long been a goal for President Donald Trump.

Six months into his first term, Trump announced he was not going to allow transgender people to serve in the military “in any capacity.” That set off a roughly two-year struggle to hammer out the complex details of how that would work, even as legal challenges poured in.

The Pentagon eventually laid out a policy that allowed those currently serving to stay and continue with plans for hormone treatments and gender transition if they had been diagnosed with gender dysphoria. But it barred new enlistments of anyone with gender dysphoria who was taking hormones or had transitioned to another gender.

Gender dysphoria occurs when a person’s biological sex does not match up with their gender identity.

That ban was overturned by then-President Joe Biden. When Trump took office again this year, he directed Hegseth to revise the Pentagon’s policy on transgender troops.

In late February, Pentagon leaders ordered the services to set up procedures to identify troops diagnosed with or being treated for gender dysphoria by March 26. And it gave them 30 days to begin removing those troops from service.

A flurry of lawsuits stalled the ban. But on Tuesday, the Supreme Court ruled that the administration could enforce the ban, while other legal challenges proceed.

There are about 2.1 million active duty, Guard and Reserve troops.

According to the Defense Department, about 1,000 service members have voluntarily identified themselves as transgender and will now begin the process of leaving the military. And while the totals are early estimates, as many as 500 of those are Army soldiers, hundreds are in the Navy and at least 50 are Marines.

Defense officials say troops began to self-identify after the February order, going to their commanders and filing out forms. That process stopped in late March due to the lawsuits, but officials said Friday they were dusting off those files and figuring out how to proceed.

Still, exactly how many troops may be affected is complicated, and the military services are grappling with how to identify and remove them all.

Defense officials have said that 4,240 troops currently serving in active duty, the National Guard and Reserve have been diagnosed with gender dysphoria And they contend that, as of late last year, about 3,200 service members had received gender-affirming hormone therapy from 2015 to 2024, and about 1,000 received gender-affirming surgery.

Previously, however, estimates of transgender troops have hovered between 9,000 and 12,000. And they could range from people who haven’t been officially diagnosed or aren’t taking medication to those who are taking medication, have undergone surgery or are in the process of transitioning to their preferred gender.