Establishments of the armed forces, including the National Guard, primarily engaged in national security and related activities. Establishments primarily engaged in manufacturing ordnance, ships and other military goods are classified in Manufacturing, Division D. Service academies are classified in Services, Industry 8221, but military training schools are classified here. Military hospitals are classified in Services, Industry Group 806. Establishments of the Coast Guard primarily engaged in the administration, operation, or regulation of transportation are classified in Industry 9621.
- Air Force
- Army
- Marine Corps
- Military training schools
- National Guard
- Navy