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**ADVANCE FOR MONDAY, MARCH 16** **FILE** In this March 31, 2008 file photo U.S. Army Staff Sgt. Chad Caldwell, left, Sgt. Jon Fleenor, center and Sgt. Jose Regalado, right, are seen after responding to shots fired in Mosul, 360 kilometers (225 miles) northwest of Baghdad, Iraq. Caldwell and Regalado were killed in action. Fleenor was injured in October and was sent home to recover.Nearly six years after American troops invaded Iraq, the men of "Killer Blue" are home- matured, scarred, looking forward to resuming their lives, finding themselves suddenly startled by what used to be routine. Not everyone made it home. For those who did, their lives in Iraq and the deaths of men who became family have forever shaped their goals for the future and their sense of the kind of people they want to be.(AP Photo/Maya Alleruzzo, File)