Captain T. Pine was a Human military officer who served in the United Earth Military in the 22nd century.
Pine was mentioned in Balthazar Edison's personnel file as his senior officer when Edison, as an acting colonel, was a lieutenant under his or her command. (Star Trek Beyond)
This character was only mentioned in writing.
As Edison served in the Military Assault Command Operations, it might be presumed Pine was a MACO officer. However, this was not stated in the file.