The U.S. Environmental Protection Agency's 2004 "Homeland Security Strategy" will guide the Agency's homeland security efforts over the next two years. It described our goals, initiatives, and key activities for protecting our country from the consequences of terrorist attacks. Many of the homeland security challenges that we face transcend political boundaries. The "Strategy" explains how we will transcend these boundaries to network and collaborate with our federal, state, local, and tribal government partners and the private sector to achieve our goals. The Agency's initial "Strategy," which was undertaken immediately following the September 11, 2001, disasters, represented EPA's vision prevention of, preparation for, and response to another catastrophic terrorist attack. The 2004 "Strategy" takes this initial effort one step further by addressing the Agency's available resources, recent Presidential Directives and expectations, and the evolving role of the Department of Homeland Security. EPA continues to evaluate its roles and responsibilities and to apply lessons learned. The challenges ahead are far different from those that existed prior to September 11, 2001, and they continue to evolve.