President Barack Obama issued four executive orders Thursday to demonstrate a clean break from the Bush administration on the war on terror, including one requiring that the U.S. military detention facility at Guantanamo Bay be closed within a year.

A second executive order formally bans torture by requiring that the Army field manual be used as the guide for terror interrogations. The order essentially ends the Bush administration's CIA program of enhanced interrogation methods.

A third executive order establishes an interagency task force to lead a systematic review of detention policies and procedures and a review of all individual cases.

A fourth executive order delays the trial of Ali al-Marri, a legal U.S. resident who has been contesting his detention for more than five years as an enemy combatant in a military brig without the government bringing any charges against him.