2512

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.^[1]
The Chiroptera-class stealth vessel is retired by the UNSC.^[2]
Admiral Michael Stanforth is appointed the head of Section Three of the Office of Naval Intelligence.^[3]
August 15th: Thomas Lasky is born in Tricode Village, Mare Erythraeum on Mars.^[4]^{[note 1]}

Notes

^ This date of birth is shown in Lasky's dog tags and his medical discharge form in Halo 4: Forward Unto Dawn. However, if Lasky were born in August 2512, he would have been thirteen years old during his time at Corbulo Academy in April 2526. He appears to be in his late teens or early twenties in Halo 4: Forward Unto Dawn, so he was likely born no later than 2508. His actor, Tom Green, was twenty-one when the webseries was filmed.