Sentinel Vanguard

One of the most powerful Sentinel types, Sentinel Vanguard are used by Monitors and other dominant Forerunner A.I.'s in accomplishing extremely difficult tasks, and combatting powerful hostiles. They have also been known to guard Monitors at times, and have been used to help control Flood outbreaks alongside Enforcers and Collosi.

Function
First created by the Forerunners solely as guardians for Monitors and other important Artificial Intelligences, the role of the powerful Vanguard quickly expanded to Flood containment and even regular war-time use. Other uses included defending areas of high importance on Halo installations, such as Libraries, dispatching small hostile aircraft, and quickly eliminating small Flood infestations.

Weaponry
Like the Sentinel Enforcer, the Sentinel Vanguard makes use of a deadly array of weaponry, not just the standard Sentinel Beam.

Primary
Primarily, the Vanguard makes use of an enlarged Sentinel Caster located directly on the front of the Sentinel, supported by two laterally-mounted fully rotational Sentinel Major Beams.

Secondary
As a secondary weapon the Vanguard uses the Sentinel Munitions Launcher, a weapon similar to Enforcers' mortars. The Munitions Launcher is primarily used to destroy vehicles, rather than live troops.

Defensive Capabilities
The Vanguard makes use of a powerful all-encompassing energy shield, similar to the one used by standard Sentinels. The shield is rather durable, and is able to withstand 3-4 shots with a UNSC M68 Gauss Cannon.