Special Operations Brigade

The Special Operations Brigade (SOB) was the special forces division of the Grand Army of the Republic, made up of clone commandos, clone assassins, Advanced Recon Commandos, and clone shadow troopers.

As the Clone Wars began, the Jedi Order formed the Special Ops Brigade to complete independent, special operation for the Galactic Senate, Supreme Chancellor Palpatine, and the Jedi High Council. Stationed with Arca Company Barracks, the Special Ops Brigade was led by Jedi GeneralIri Camas and later Jedi General Arligan Zey. When General Zey took command, the brigade consisted of 10,000 troops

It was later reorganized as the Imperial Commando Special Unit.

Command structure
The Special Operations Brigades were commanded by Jedi General Arligan Zey. It consisted of ten Commando Groups, or battalions, by one year after the Battle of Geonosis.
 * Special Operations Brigade —20 Commando Groups (10,000 troopers plus support personnel), commanded by Jedi General Arligan Zey.
 * Commando Group —5 companies (500 troopers plus support personnel), commanded by a Jedi General.
 * Company—5 troops (100 troopers plus support personnel), commanded by a Clone Commander.
 * Troop—5 squads (20 troopers ), commanded by a Jedi.
 * Squad—4 troopers, including a sergeant.

Special ops variants
One notable exception was the Covert Ops clone troopers. They were elite clones of the GAR assigned to doing 'dirty work' that most clones would find questionable and unethical for the Republic. The Director of Special Forces ignored the existence of those clones for a long time and they were supposed to take orders from the Office of the Supreme Chancellor.
 * Clone commandos mostly conducted direct action and special recon missions, in a tactical capacity.
 * Alpha-class Advanced Recon Commandos served a more strategic purpose, conducting special reconnaissance and special sabotage missions. They were more obedient and reliable to the Jedi than the Null-Class ARCs.
 * Null-class Advanced Recon Commandos specialized in reconnaissance. Less obedient than the Alpha-class ARCs.
 * Shadow troopers specialized in gathering intelligence, special sabotage missions, counter intelligence, combating terrorism and espionage.
 * Clone assassins were trained specifically to eliminate Jedi in case of their rebellion against the Senate and the Republic by utilizing Teräs Käsi, a form of unarmed combat.