Answer:
Written sources and anthropology
<u>Answer</u>:
<em>Department of Homeland Security </em>
<u>Explanation</u>:
Department of Homeland Security functions to secure the nation from threats and works in field of <em>cybersecurity, border security, chemical facility inspector and emergency responses.
</em>
The Joint Staffs is composed to advise <em>president and secretary of defense on military matters.
</em>
The Chairman of the Joint Chiefs of Staffs (CJCS) is functions to advise president, secretary of defense, and other three <em>players of National security council on Military matters. </em>
Department of Defense <em>functions to stop war and provide defense to the country
.</em>
I did my homework and watched tv
