We could ask why in the world would Obama kept this guy on for so long while at the same time promising to close the place but I guess it is just another example of Obama's spinelessness.
From Charlie Savage at the NY Times :
Mr. Lietzau has played a major role in shaping detention policies across two administrations. After the terrorist attacks of Sept. 11, 2001, when he was a uniformed lawyer for the Marine Corps, he served as an adviser in the creation of the first version of President George W. Bush’s system of military commissions trials.
In the Obama administration, he has been the primary official shaping policies for “law of war” detention at the prison at Guantánamo Bay and Bagram Air Base in Afghanistan.
Read the rest here.