Summary
Enforcers are massive robotic automatons designed by the Forerunners that serve to contain major Flood outbreaks on Halo Installations. They have the same basic design as the Sentinel, with three notable exceptions.
One is the gold-colored armor plating replacing the normal silver-colored armor plating. Whether this is simply a color difference or a different armor alloy altogether is unknown.
The second difference is that the Enforcers are armed with Advanced Sentinel Beams that fire blue-colored lasers instead of the weaker orange-colored beams that normal Sentinels use.
The third is the Enforcer's energy shielding, which can absorb more damage than a normal Sentinel. The shield, which only guards the front area of the machine, is immune to ballistic weapons, similar to the Jackal shield, but is weak against plasma weapons.
An Enforcer is armed with rapid firing pulse beams similar to Needler fire, and mortar-like projectiles. Its mechanical grabbing arms can pick up and crush even heavy vehicles such as Scorpion Tanks if the driver is careless.
Although an Enforcer is capable of dropping small bombs and firing red plasma, neither of these are particularly damaging. Still, it is best to destroy these machines, in most cases.
They were only observed on Installation 05.