A branch, alternately referred to as a service or a service branch, is one of the major components of The Royal Manticoran Navy: The Official Honor Harrington Fan Association, Inc. (TRMN).
The branches of TRMN are:
- Royal Manticoran Navy
- Royal Manticoran Marine Corps
- Royal Manticoran Army
- Grayson Space Navy
- Republic of Haven Navy
- Imperial Andermani Navy
- The Civilian Corps
- Royal Manticoran Merchant Marine
- Royal Manticoran Astro Control Service
- Sphinx Forestry Commission
Each TRMN member selects which branch they wish to belong to, and may change their branch as they wish.