Not long after I first started at Military Times, I had a conversation with a colleague, Andrew Tilghman, about a particular memory he had of an embedded assignment in Iraq. Covering Army operations in violent Mahmudiyah in 2006, he had several striking conversations with Army Pfc. Steven Green, who offered a simple statement: “I came over here to kill people.” Tilghman, not yet employed by Military Times at the time, later wrote about the encounter for the Washington Post. The memory became especially vivid after Green was convicted of raping a 14-year-old Iraqi girl, then killing her and her family.…