The enigmatic Clandestine Operations Unit are one of the most mysterious and poorly understood units in the USR Special Warfare Group. The COU, better known as the Assassins, are made up of the best infiltrators and singular warriors the Republic has, with each being specialists, expert marksmen and sword masters. They are expected to infiltrate an area by themselves and eliminate their targets, before leaving, hopefully never being discovered in that time. The are the most secretive of all Sangheili forces, being spread across much of the Republic in sleeper cells of up to five, with only two Assassins in a cell being active at a time. These will usually preform missions in the local theatre, usually against internal threats, but will often accompany the military in high level operations,