There are five different branches, the Army, Air Force, Navy, Marine Corps, and Coast Guard.
Step-by-step explanation:
Each branch of the United States Military has diverse roles in maintaining the security of the country. Their job descriptions and roles differ but they have a common purpose and that is to fight against the enemies and safeguard the country.
It is not only about protecting the country but also safeguarding the constitution and see to that there is no breach of the political decisions made. Mostly all branches of the US military provide either warfare backing or combat service support.