When he was candidate Obama and the land was still in its fizzy, hopeychangey phase, the slick talkin' man vowed to shut down the Bushitler's hated Gitmo, along with the hated military trials, and cast the prison's inhabitants to the winds. The only part of that promise he's come through on to a certain extent (hello, Uighurs!) is the final one. And now he's not only decided not to shut the joint down, he's given the go-ahead for the resumption of military trials.
Of course, Obama being Obama, he thinks he'll get away with it by claiming he still has great faith in the regular judiciary to try terrorists/jihads (neither of which word he would ever dare use).