February: Majid Khan pleads guilty to charges of conspiracy, murder in violation of the law of war, attempted murder in violation of the law of war, providing material support for terrorism, and spying.
May: Salim Hamdan’s appeal of his conviction, Hamdan v. United States, is argued before the U.S. Court of Appeals for the D.C. Circuit.
May: Khalid Shaikh Mohammad, Walid Muhammad Mubarak bin ‘Attash, Ramzi bin al Shibh, Ali Abdul Aziz Ali, and Mustafa Ahmed Adam al Hawsawi are arraigned jointly. They are charged with conspiracy, attacking civilians, attacking civilian objects, intentionally causing serious bodily injury, murder in violation of the law of war, destruction of property in violation of the law of war, hijacking or hazarding a vessel or aircraft, and terrorism in connection with their alleged roles in the planning and execution of the attacks of September 11, 2001, in New York, Washington D.C., and Shanksville, Pennsylvania, resulting in the killing of 2,976 people.
October: In Hamdan v. United States (Hamdan II), the U.S. Court of Appeals for the D.C. Circuit reverses the decision of the United States Court of Military Commission Review and orders that the conviction for material support for terrorism be vacated. The Court determined that the Military Commissions Act did not intend to retroactively punish new crimes, and that material support for terrorism was not a pre-existing war crime under international law. The Court concluded that Mr. Hamdan could not be convicted of providing material support for terrorism based on conduct occurring before the effective date of the Military Commissions Act.