A Barrier Tower[1][2] is a Forerunner shield-generation tower.
Three of them surrounded the Citadel on Installation 00, projecting an energy shield that denied access to the Citadel. They could be individually deactivated by means of a holographic control panel on their upper floors[3].
=Battle of Installation 00
During the battle on Installation 00 in late 2552 between the United Nations Space Command/Covenant Seperatists alliance and the Covenant Loyalists, the UNSC and the Elites sought access to the Citadel, but were barred by means of the energy shield of the three Barrier Towers. Commander Miranda Keyes coordinated a simultaneous assault on all three towers, ordering SPARTAN-117 and a small Orbital Drop Shock Trooper and Marine force to take the first eastmost Barrier Tower, the Arbiter and the Elites to take the middle Barrier Tower, and for Avery J. Johnson and a Marine detachment to assault the westmost Barrier Tower.
- ^ Halo 3: The Official Guide, page 88
- ^ The Covenant (Level), Halo 3
- ^ Halo 3: The Official Guide, page 90
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