The Department of Defense has issued new guidance ordering the military services to begin the process of discharging transgender members of the Armed Forces in 30 days. The new policy recognizes only two sexes; it requires members of the Armed Forces to adhere to the physical fitness and grooming standards of their biological sex. Any attempt at chemically or surgically changing sex makes the person unsuitable for military service. If a person had, at some point, been transgender they can be retained if they "demonstrate “36 consecutive months of stability” in their sex with no “clinically significant distress or impairment” if they can prove they have “never attempted to transition to any sex other than their sex” and if they are willing to adhere to “all applicable standards” relating to their sex."

DOD Memo Discharging Transgenders by streiff on Scribd

f. The Department only recognizes two sexes: male and female. An individual's sex is immutable, unchanging during a person's life. All Service members will only serve in accordance with their sex, defined in Executive Order 14168, "Defending Women from Gender Ideology Extremism and Restoring Biological Truth to the Federal Government," as "an individual's immutable biological classification as either male or female." 

g. Where a standard, requirement, or policy depends on whether the individual is a male or female ( e.g., medical fitness for duty, physical fitness and body fat standards; berthing, bathroom, and shower facilities; and uniform and grooming standards), all persons will be subject to the standard, requirement, or policy associated with their sex. 

h. Pronoun usage when referring to Service members must reflect a Service member's sex. In keeping with good order and discipline, salutations ( e.g., addressing a senior officer as "Sir" or "Ma'am") must also reflect an individual's sex.

The memo reiterates an earlier policy that barred transgender individuals from enlisting; see SecDef Hegseth Orders an End to Enlisting Transgenders – RedState.

Even though the precursor to this policy is in litigation (see DOJ Files Misconduct Complaint Against Hostile and Biased Judge Overseeing the Military Transgender Case – RedState), it seems unlikely to be successful. Similar legal histrionics followed Trump's ban on transgenders in the military in 2017. That ban was upheld by the Supreme Court in a 2019 decision (see Supreme Court Allows Trump Administration to Restrict Transgender Service in Military While Lawsuits Are Ongoing – RedState) before Joe Biden reversed the policy in 2021; see Opinion: Defense Secretary Austin Plays Politics Right out of the Gate – RedState.

The ban on transgenders is long overdue. If a transgender has progressed beyond the point of Klinger-esque crossdressing, they probably are not deployable because of the psychiatric and medical care they need to continue their attempt to transition from something they are into something they aren't. In context, a kid with braces can't enlist. A kid who has taken Adderall or Ritalin in the previous three years can't enlist. And yet we not only enlisted transgenders, we allowed them to have surgery at government expense.

Mirroring the experience of young women in varsity athletics, men "transitioning" to women were bunked with military women; see Report: Navy Says Sailors Can Use Whichever Locker Room Suits Their Gender Identity – RedState and Report: The Army Will Force Female Soldiers to Shower With Biological Males – RedState.

Finally, the entire project was corrosive of military discipline. Guidance was issued on addressing a 6-2, 220-pound bearded officer wearing a skirt (A US Navy That Instructs on Pronouns Is a Navy Unprepared to Fight a War – RedState). Anecdotally, the fear of being accused of being a "transphobe" frequently let transgenders exhibit behavior and performance that would get a regular soldier punished. 

The new guidance clears the decks, so to speak, for the military to toss aside this modern-day version of Robert S. McNamara's Project 100,000 and get back to the business of training to win wars.