Libyan rebels carry the coffin of assassinated Army Chief Abdel Fatah Younis on July 29 in Benghazi, Libya. Even as it prepares to hand over the Libyan embassy in Washington to the rebel government, the State Department is warning the Transitional National Council to get its act together. An administration official told CNN the United States has warned the TNC that this is a "do-or-die moment" for the organization to carry out a credible and thorough investigation of the killing of its military commander, Abdel Fatah Younis. Last week's mysterious assassination has raised concerns that it might have been carried...