Sentinels
From Halopedia, the Halo wiki
Summary
The Sentinels are the guardians of the Halos, and can be controlled by the Monitor of the Installation.
They are hovering robots equiped with an energy weapon called a Sentinel Beam. These beams are used to control The Flood, however they can only manage them for short periods. In Halo 2, after a Sentinel is destroyed, these beams can be picked up and wielded by a foot soldier.
When not engaged in combat, they contract into smaller forms, concealing their weaponry. In later levels of Halo 2, some sentinels are equipped with energy shields, though all sentinels are easily destroyed by plasma weapons.
Images
http://img137.exs.cx/img137/8495/sentinelthumb6ap.jpg
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