Overview: “Gangs of Iraq” examines the four-year effort to train Iraqi forces to “stand up”; and how the Coalition-trained Iraqi military and police have been infiltrated by sectarian militias. Also: “The Case for War: In Defense of Freedom” follows former assistant defense secretary Richard Perle, who championed the invasion of Iraq, as he defends the war; and debates opponents, including the wife of a U.S. soldier serving in Iraq, and former UN ambassador Richard Holbrooke.