This day marked the Marines’ heaviest fighting since Vietnam and was the start of the Iraqi insurgency. By the end of the day more than 40 Marines and hundreds of Iraqis were dead. General Sanchez, commander of US forces that day, gives his perspective. And, we hear from the Marines who were there about a day they’ll never forget. 

On March 20, 2003, the US invaded Iraq. More than 6 years later we're still there. What happened? Were we prepared? We hear from the planners of the war in Iraq, from Neoconservatives, to Department of Defense officials. From members of the Iraqi government to military personnel. Will their preparations lead us to peace or … more war? 

For many soldiers and Marines, war is not fundamentally about the mission. War is not really about the enemy. It's not even about patriotism. War is about the man to the left and right of you. War is about your buddy. And it's that camaraderie, that esprit de corps that is the glue that holds the U.S. military together. In this hour of To the Best of Our Knowledge – a talk with U.S. soldiers and Marines who served in Iraq about Esprit de Corps.

At least 120 journalists have been killed in Iraq since the war began. They're targets for insurgents. But what are journalists to the US military? A necessary evil? Or weapons of war? In this hour of To the Best of Our Knowledge, How well have journalists covered the war. We'll hear from journalists embedded in Iraq. Can journalists accurately report on the very soldier or Marine who protects them? 

President Obama says our combat mission in Iraq will end by August 31, 2010. This leaves many unanswered questions. What was our mission in Iraq? Did we succeed? What will become of the country we invaded? Whatever the answers, our troops are coming home. But what are they coming home to? In this hour of To the Best of Our Knowledge, we'll talk with Iraq War veterans about the challenges of coming home. And, what about us? Are WE ready for THEM?