From Halopedia, the Halo wiki
This rank is almost identical to the Spec Op Elites, the Banished that employ Prowling Elites, these Elite lead a number of Grunts to stealthily scout around or for reconnaissance & kill enemies, they are equipped with active cameo and are faster than standard Grunt Squads. They are employed by Arbiter.
Prowling Grunts are core infantry can perform decent against infantry and aircraft, but terrible with vehicles.
List of appearances