Headquarters, also known as an HQ, is any location in which allies can gather together and discuss various political and military situations. A modern day example of this is the UN HQ located in New York City, New York, in the United States.
Various examples of an HQ includes:
- The UNSC's main HQ on the planet Reach before it was glassed by the Covenant. After the Fall of Reach, HIGHCOM Facility Bravo-6 in Sydney, Australia served as the headquarters of the UNSC.
- Alpha Base, the HQ of the UNSC Pillar of Autumn's survivors; it was abandoned and destroyed during the closing stages of the Battle of Installation 04.
- Crow's Nest, an old military base re-purposed as the HQ of the remaining UNSC Marines in Kenya late in the Battle of Earth; it was attacked by the Covenant and evacuated during the events of Halo 3.
- High Charity, the Covenant HQ; it was infested by the Flood during the events of Halo 2 and brought to Installation 00, where it was boarded and destroyed by John-117 and the Arbiter.