2558

February
February 8
 * returns to Requiem to establish research facilities on the shield world. Commander Sarah Palmer, leader of the Infinity ' s Spartan contingent, sends various Spartan teams, including Fireteam Crimson and Majestic to the surface of Requiem.

Unknown date
 * The UNSC Infinity is invaded by the Covenant remnant and Promethean forces.
 * Gek is killed by Fireteam Majestic
 * Dr. Catherine Halsey is kidnapped by the Covenant remnant and Promethean forces.
 * Admiral Serin Osman orders Captain Lasky kill Dr. Halsey, with Sarah Palmer being the one will execute the order.
 * Lasky sends Fireteam Majestic to rescue Dr. Halsey and stop Palmer.
 * The Librarian gives Dr. Halsey the Janus Key, but Jul 'Mdama gets half of the key, Gabriel Thorne while Gabriel Thorne gets the other half.
 * Requiem is destroyed to be consumed by the sun.

Trivia
This time frame is the setting of Halo 4's Spartan Ops mode.