DHS and Points of DOD Involvement Command and Control in the Homeland (C2) What is meant by a bottom-up approach? Shouldn’t those with more knowledge and authority be in command? Four C2 options are available to our military and civilian leadership. What are they? Paraphrase. Give example of each. Department of Defense Support to Domestic Incidents At what point would the military be involved in a terrorist attack? Give example. Use citations to back up your statements. DHS Website: Locate the Five Homeland Security Missions. Which mission(s) would DOD be involved? Give examples.