Military branch (also service branch or armed service) is according to common standard the subdivision of the national armed forces of a sovereign nation or state. In classical terminology, the three basic military branches are the Army, Air Force, and Navy.
Countries which do not have access to any of the high seas or any oceans generally do not have a national navy.
In some countries there might be other military branches. In addition to the above-mentioned military branches, examples are:
France
Gendarmerie Nationale
Italy
Carabinieri
Norway
Home Guard
Poland
Special Forces
Russia
Airborne Troops
Russia
Aerospace Defence Forces
Russia
Strategic Missile Troops
South Korea
Marine Corps
Taiwan
Military Police
USA
US Coast Guard
USA
US Marine Corps
The Canadian Armed Forces is the unified armed forces of Canada. While it has three environmental commands - namely Royal Canadian Navy, Canadian Army and Royal Canadian Air Force - it remains a single military service.
The military branches came into being in line with military technical progress and have been developed permanently. With that background, the air force was established early in the 20th century as one of the latest armed service.
The army is traditionally the oldest – and in many countries the biggest armed service.
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 serviced or armed service.