2512

December

 * December 19: The Superintendent AI is created.

Unknown

 * Around this year, a geological survey team on Sigma Octanus IV finds rocks with odd compositions. They later found out these rocks were introduced from meteor impacts roughly 60,000 years earlier and contained a Forerunner shard among them.
 * The Chiroptera-class stealth vessel is retired by the UNSC.
 * Admiral Michael Stanforth is appointed the head of Section Three of the Office of Naval Intelligence.
 * The M392 Designated Marksman Rifle is introduced into service.