The US military is nearing the end of its investigation of Abu Ghraib prisoner abuse with the court-martial of Army Lt. Col. Steven L. Jordan, who is accused of approving some mistreatment, allowing it to continue and lying about it afterwards. A trial for Jordan, 51, will begin Monday at Fort Meade, Maryland. He has pleaded innocent to the six charges, which could bring a 16 1/2-year prison sentence. He is the last of 12 defendants - and the only officer - charged in a probe triggered by photographs showing low-ranking US soldiers assaulting and humiliating naked detainees at the prison in Iraq in late 2003 and early 2004. Jordan, the former director of the prison's interrogation center, is not in any of the pictures but is charged with illegally approving the use of dogs and nudity during interrogations.