According to Military.com:
A new Defense Department policy handbook gives transgender service members and their commanders a road map for gender transition in the active-duty military and Guard and Reserve.
The 71-page policy, released Sept. 30, lays out the medical process for service members who wish to change genders. A second section gives commanders a framework for working with transgender troops in their units, including a guide to gender pronouns and physical fitness standards for troops in transition.
“The handbook is designed to assist our transgender Service members in their gender transition, help commanders with their duties and responsibilities, and help all Service members understand new policies enabling the open service of transgender Service members,” it says. “The handbook includes advice, questions and answers, and scenarios.”