Service Branches:

The six branches are distinct in their areas of operation and focus, but all contribute to the overall mission of national defense.

Active Duty and Reserve Components:

The military includes both active-duty personnel, who serve full-time, and reserve components (like the National Guard and Reserves) who train part-time and can be called upon for active duty when needed.

Department of Defense:

The military is part of the Department of Defense (DoD), which is the largest employer in the U.S.