The Department of Defense (DoD) is responsible for the security of the United States.
Some of the departments and agencies under the DoD are:
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Department of the Army
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Department of the Navy
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Department of the Air Force
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United States Army
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United States Navy
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United States Marine Corps
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United States Space Force
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National Guard
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Defense Intelligence Agencie (DIA)
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National Geospatial-Intelligence Agency (NGA)
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National Reconnaissance Office (NRO)
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Defense Advanced Research Projects Agency (DARPA)
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Defense Logistics Agency (DLA)
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Missile Defense Agency (MDA)
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Defense Health Agency (DHA)
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Defense Threat Reduction Agency (DTRA)
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Defense Counterintelligence and Security Agency (DCSA)
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Space Development Agency (SDA)
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Pentagon Force Protection Agency (PFPA)
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Defense Contract Management Agency (DCMA)
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Eisenhower School (ES)
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National War College (NWC)
https://en.wikipedia.org/wiki/United_States_Department_of_Defense