Jiralhanae Stalkers and Sangheili Spec-Ops are hidden task-force operatives. They use Active Camouflage, sneaky movement, and hidden tactics. There are two types of these warriors, Stealth and Active Camo. Those wearing the Stealth harnesses are always cloaked, with a trade that they cannot use shields. Active Camo allows the soldiers to be cloaked much more efficiently, but for a set amount of time that is interrupted by incoming damage, which is reflected by their use of a shield.
These soldiers are all dangerous, and highly trained. The slightest mistake in tracking an invisible foe is your life.