Alpha Halo

Alpha Halo could refer to many things in relation to Halo.


 * Installation 04 - The first Halo installation discovered by the UNSC. Destroyed by John-117 during the Battle of Installation 04, on September 22nd, 2552.
 * Alpha Shard - A shard of Installation 04, that was transported through slipspace into orbit around a red giant during the ring's destruction.
 * Installation 08 - A replacement Halo installation, created in response to the destruction of Installation 04. Prematurely activated, and hence destroyed, by John-117, Thel 'Vadam and Avery Johnson during the Raid on Installation 08.
 * Installation 09 - A second replacement Halo installation, nicknamed "Anders' Halo". Disarmed by Ellen Anders in April, 2559, and later intercepted by the Created while en-route to the Soell system.