Keyes was an influential officer in the UNSC, using unconventional tactics to help win the Battle of Sigma Octanus IV and Installation 04.
HOMEWORLD: Earth, Sol system
BORN: February 8th, 2495
DIED: September 22nd, 2552
SERVICE RECORD
Jacob Keyes was a decorated officer in the UNSC Navy, known for his brilliant tactics that allowed him to beat Covenant forces of superior strength and numbers. In particular, he is remembered for his actions around Sigma Octanus IV, where he outmaneuvered and destroyed three Covenant vessels in a single destroyer, which was named the Keyes Loop. He was given command of the UNSC Pillar of Autumn after Sigma Octanus IV, where he managed to survive the Fall of Reach and escape with John-117 and Cortana to Installation 04. It was here where Keyes finally met his demise, getting captured by the Flood and absorbed into its collective mind.
The Battle of Charybdis IX was a Covenant assault on the planet Charybdis IX in the Charybdis system sometime in 2535, prior to the Battle of the Rubble.
The Battle of the Rubble was a battle that took place in the 23 Librae system on a grouping of Lagrangian asteroids trailing Hesiod, a gas giant in the system, some time around 2535.
The Battle of Metisette occurred in the immediate aftermath of the Battle of the Rubble in 2535, taking place on Metisette, the nearby moon of the gas giant Hesiod.
The Battle of Sigma Octanus IV was a large-scale space and ground battle between UNSC and Covenant forces in the Sigma Octanus system in July 2552.
The Fall of Reach was possibly the largest battle during the Human-Covenant War, taking place in the Epsilon Eridani system, in orbit and on the ground of Reach, humanity's largest military stronghold.
The Battle of Installation 04 was an engagement between the UNSC Pillar of Autumn and the Covenant Fleet of Particular Justice on and around the Forerunner megastructure known as Installation 04, or Alpha Halo, in the Soell system.
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REFERENCE BOOKS

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