This United States Marine Corps USMC manual, Marine Corps Tactical Publication MCTP 6-10A Sustaining the Transformation August 2024, is focused on one of our key leadership principles: know your Marines and look out for their welfare. It is a companion to Marine Corps Warfighting Publication MCWP 6-10 Leading Marines, and provides more detail to leaders about how to take care of their Marines through the transformation process. It is a leadership tool that provides sound examples and methods for success. Sustaining a Marine through this process requires engaged leadership. I encourage you to use this reference as a starting point for discussions among peers, subordinates, and seniors. Your dialogue and application will improve the welfare of all Marines and our institution.