WASHINGTON (Reuters) - The U.S. military will not punish a Marine who performed an obscenity-laced song to a laughing and cheering crowd of fellow troops in Iraq making light of killing Iraqis, the Marine Corps said on Tuesday. The Marines two weeks ago launched a preliminary inquiry into whether Cpl. Joshua Belile, who returned home from Iraq in March, violated military law or rules in singing the song, a four-minute video of which was posted on the Internet. In the song, titled "hadji girl," Belile sang to fellow troops at a base in Iraq about encountering an Iraqi woman and...