Role of the department of defense

Discussion Questions: Provide a brief overview of the roles of the following entities as they relate to homeland security.

• Department of Defense and in particular US Northern Command (NORTHCOM).
• National Guard

What is the Posse Comitatus Act, and how does it impact the use of the military assets of the Department of Defense in supporting homeland security activities?

Response must be 400 words or more in APA format.