The death toll of American soldiers hit 4,000 on Easter Sunday, five years after the invasion that started the war.

The tragic milestone was reached when a roadside bomb in Baghdad claimed four service members.

The White House called it a “sober moment” and noted that President Bush reflects daily on the lives lost and the brave men and women still fighting in Iraq.

Most of those who have died—72 percent—served in the U.S. Army. Another 24 percent were from the Marine Corps. The Navy and Air Force made up 2 percent and 1 percent, respectively. Even the Coast...

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