The Military Commissions Act of 2009 (MCA 2009): Overview and Legal Issues (PDF)
Source: Congressional Research Service (via Federation of American Scientists)
On November 13, 2001, President Bush issued a Military Order (M.O.) pertaining to the detention, treatment, and trial of certain non-citizens in the war against terrorism. Military commissions pursuant to the M.O. began in November 2004 against four persons declared eligible for trial, but the Supreme Court in Hamdan v. Rumsfeld invalidated the military commissions as improper under the Uniform Code of Military Justice (UCMJ). To permit military commissions to go forward, Congress approved the Military Commissions Act of 2006 (MCA), conferring authority to promulgate rules that depart from the strictures of the UCMJ and possibly U.S. international obligations. Military commissions proceedings were reinstated and resulted in three convictions under the Bush Administration.