Our success in this war is often measured by the things that did not happen. We cannot know the full extent of the attacks that we and our allies have prevented, but here is some of what we do know: We stopped an al Qaeda plot to fly a hijacked airplane into the tallest building on the West Coast. We broke up a Southeast Asian terror cell grooming operatives for attacks inside the United States. We uncovered an al Qaeda cell developing anthrax to be used in attacks against America. And just last August, British authorities uncovered a plot to blow up passenger planes bound for America over the Atlantic Ocean. For each life saved, we owe a debt of gratitude to the brave public servants who devote their lives to finding the terrorists and stopping them. (Applause.) Every success against the terrorists is a reminder of the shoreless ambitions of this enemy. The evil that inspired and rejoiced in 9/11 is still at work in the world. And so long as that's the case, America is still a nation at war. In the mind of the terrorist, this war began well before September the 11th, and will not end until their radical vision is fulfilled. And these past five years have given us a much clearer view of the nature of this enemy. Al Qaeda and its followers are Sunni extremists, possessed by hatred and commanded by a harsh and narrow ideology. Take almost any principle of civilization, and their goal is the opposite. They preach with threats, instruct with bullets and bombs, and promise paradise for the murder of the innocent. Our enemies are quite explicit about their intentions. They want to overthrow moderate governments, and establish safe havens from which to plan and carry out new attacks on our country. By killing and terrorizing Americans, they want to force our country to retreat from the world and abandon the cause of liberty. They would then be free to impose their will and spread their totalitarian ideology. Listen to this warning from the late terrorist Zarqawi: "We will sacrifice our blood and bodies to put an end to your dreams, and what is coming is even worse." Osama bin Laden declared: "Death is better than living on this Earth with the unbelievers among us." These men are not given to idle words, and they are just one camp in the Islamist radical movement. In recent times, it has also become clear that we face an escalating danger from Shia extremists who are just as hostile to America, and are also determined to dominate the Middle East. Many are known to take direction from the regime in Iran, which is funding and arming terrorists like Hezbollah -- a group second only to al Qaeda in the American lives it has taken. The Shia and Sunni extremists are different faces of the same totalitarian threat. Whatever slogans they chant, when they slaughter the innocent they have the same wicked purposes. They want to kill Americans, kill democracy in the Middle East, and gain the weapons to kill on an even more horrific scale.