WASHINGTON (AFP) - Two US army officers were relieved of command after an investigation found that three soldiers killed by insurgents in Iraq last year were left alone for 36 hours at an undermanned and unprotected observation point, army officials said Thursday. The June 16 attack, in which two of the soldiers were abducted and their mutilated bodies were found days later, has come under renewed scrutiny following the abduction of three other US soldiers during an insurgent attack this week. The investigation, which was completed last year but not released until Thursday, found a string of errors that exposed...