Military branch
Subdivision of the national armed forces
From Wikipedia, the free encyclopedia
A military branch (also service branch or armed service) is a first level subdivision of the national armed forces of a state.

Types of branches
Unified armed forces
The Canadian Armed Forces is the unified armed forces of Canada. While it has three distinct commands – namely the Canadian Army, Royal Canadian Navy, and Royal Canadian Air Force – it remains a single military service.[1]
NATO definition
Branch of service (also branch of military service or branch of armed service) refers, according to NATO standards, to a branch, employment of combined forces or parts of a service, below the level of service, military service, or armed service.[2]