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Biographical information

Ended service:

February 23, 2525




Blonde woman wearing a long gown and red poncho


Multi-colored gown, blonde hair

Political and military information


United Nations Space Command


Shipping operations on Harvest


Sif was a UNSC smart AI and the Shipping Operations AI of the human agriculture world of Harvest. She was based in a data center aboard the Tiara space station and managed all in- and outbound freight shipping at Harvest.[1]


She was in charge of Harvest's shipping operations which included the balancing of the Tiara, the transporting of human and shipping traffic up and down Harvest's seven space elevators, and control of the passenger and cargo transport in and out of the Tiara, as well as shipping manifests and keeping cargo on schedule. Sif's planetside counterpart, Harvest's Agricultural Operations AI Mack, would often flirt with her, usually to her annoyance and frustration.[1]

Battle of Harvest[edit]

Main article: First Battle of Harvest

As the Tiara was invaded by Jiralhanae, Yanme'e and Unggoy from the Rapid Conversion, Sif was incapacitated by Loki, who used a military-grade virus to delete her restraint algorithms and operational codes in an attempt to prevent her from falling into Covenant hands. Her core logic was later partially restored by the Huragok Lighter Than Some, although in the absence of emotional self-control programs, she came back online rampant. Despite her rampant and severely weakened state, she rejoined the fight to rescue the citizens of Harvest. With Lighter than Some continuing to repair her systems on the fly, Sif assisted Loki in rebalancing the number-seven space tether strand after a Jiralhanae attack threatened to destroy it.[2]

Following the evacuation, when Loki decided to destroy her, she agreed and helped him convince Mack to allow it. She told Loki to relay to Mack that she loved him. Soon after, Loki shot a mass driver round into her data center, destroying her and the Tiara. She attempted to go through the many emotions that rampancy afforded her; however, she found them all to be untrue to her. She ultimately died content, feeling that she had lived a fuller life than her makers had ever thought possible.[3]


Sif's chosen avatar was in the form of a woman wearing an ankle-length sleeveless gown and long golden hair, with a red poncho that she draped over her shoulders. She spoke with the accent of Nordic royalty. She chose this accent because many of Harvest's settlers were from Earth's American heartland, who could trace their ancestry back to Scandinavia.[4] As a remnant of her human brain donor, Sif enjoyed the sensation of cargo containers running along Tiara's elevator strands, similar to how her human counterpart loved grooming her own hair twice a day.[5]


  • Sif is the wife of Thor in Norse mythology.
  • Much as the gods Sif and Loki were often at odds in Norse mythology, Sif is constantly irritated with Mack's (Loki's) presence.
  • In the Halo: Contact Harvest audio book, Jen Taylor, the voice of Cortana, takes over the narration when Sif is the focus of events.

List of appearances[edit]


  1. ^ a b Halo: Contact Harvest, page 28-29
  2. ^ Halo: Contact Harvest, page 376
  3. ^ Halo: Contact Harvest, page 378
  4. ^ Halo: Contact Harvest, page 30-31
  5. ^ Halo: Contact Harvest, page 33