Joint Doctrine dictates that we will train as we intend to fight. By staying trained and ready, our military is able to execute its constitutional responsibility of protecting America, its people, its borders, and its global interests. If the tragic events of September 11, 2001 are a sign of what's ahead, then the way we train must also focus on non-traditional threats at home. Most importantly, we must forge new training partnerships with local, state, and federal civilian responders in order to strengthen the civil-military seams in the effort to ensure domestic preparedness. The recent creation of the Office of Homeland Security and a new combatant command responsible for homeland defense, represent sweeping organizational changes in DoD and the federal government. These changes demand a new approach to training readiness as the military maps its doctrine tor civil support. The international security environment is fraught with many challenges. This paper examines existing response capabilities at the local, state, and federal levels to determine the adequacy of our current response mechanism. It explores the roles, missions, and functions of the key actors, while assessing the training programs at each level. The paper looks at current organizational structures and operational concepts for securing and defending the homeland at every level in order to ascertain whether existing response systems adequately prepare for the security challenges in the new environment. Finally, focusing on JFCOM's training support role, this paper will recommend a solution set where DoD assumes an expanded role to meet America's training requirements that helps synchronize national assets for homeland defense.