The 561st Legion or the 561st ARC Brigade was an elite brigade made up of ARC Troopers. The Unit was created as a special forces unit during the Clone Wars to counter CIS Droid forces without sending in an entire army. The brigade was often commander by Commander Rarar and sometime by Jedi Master Roshi. The brigade was very famous for Operation Exodus, during which the bulk of the CIS Air Squadron was destroyed on the ground.