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Sentinel Captains are Forerunner Sentinel-class constructs, distinguished by their strategically-oriented artificial intelligence and improved armament and defensive systems. They serve as lieutenants for Monitor-class AIs on Forerunner installations, and, in the event of Monitor incapacitation, as hosts for their AI.

117649 AR's Sentinel Variants & Related Articles
Leadership Role Sentinel Overseer | Sentinel Captain | Sentinel Mind | Monitor
Standard Variants Sentinel | Sentinel Major | Sentinel Hunter
Repairing Variants Sentinel Medic | Sentinel Constructor
Heavier Variants Sentinel Enforcer | Sentinel Vanguard | Sentinel Colossus
Supporting Role Sentinel Watch | Sentinel Ward
Systems and Programs Sentinel Targeting Ledger | Sentinel Shielding Grid
Weaponry Sentinel Beam | Sentinel Major Beam | Pulse Beam | Sentinel Caster | Sentinel Mortar Launch System | Sentinel Munitions Launcher | Colossus Laser
Facilities and Installations Installation-07 | Installation-0-1