Confusion in defining Homeland Security

Why is there confusion in defining Homeland Security?
Describe the interdepartmental structure of the Department of Homeland Security.
Explain the comparison of intelligence gathering to academic research, as indicated in the text. Explain how this process is directly applicable to gathering intelligence.
Define national security intelligence and criminal intelligence. What is the difference between national security and law enforcement? According to Richard Best, what two channels of information should law enforcement plan and develop?
Why do symbols hold special importance for terrorism and counterterrorism?