Phoenix Logs/Banished Units/Elite Rangers
From Halopedia, the Halo wiki
Anti-infantry marksman and skirmishers.
The Elite Rangers are specialist infantry units devoted to anti-personnel duties. They are armed with rapid-fire Covenant Carbines with excellent range. They rely on their mobility to stay out of danger and can often severely diminish enemy forces before being with range of a counterattack.
Rangers serve as the skirmishers and snipers of the Shipmaster's mercenary group, tasked with eliminating high-value enemy leaders and scouting routes for his raiding squads. Rangers deploy in pairs that can operate for days, even weeks, away from the main Banished forces. All are hardened raiders and merciless killers who would [and did] sell their own clan if there was profit in it.