2,000 - A Mark on the Wall

Army Lt. Col. Steve Boylan, director of the force's combined press center, described the number as an "artificial mark on the wall."

"I ask that when you report on the events, take a moment to think about the effects on the families and those serving in Iraq," Boylan said in an e-mail. "The 2,000 service members killed in Iraq supporting Operation Iraqi Freedom is not a milestone. It is an artificial mark on the wall"