From Halopedia, the Halo wiki
In March of 2555, Sehar was selected as weapons officer of the corvette Mayhem and assigned on a joint operation between the United Nations Space Command and the Swords of Sanghelios to stop the firing sequence of the recently activated Halo Array. After traveling through the slipspace portal at Voi, Kenya on Earth and arriving over Installation 00, Mayhem was attacked by several Retrievers. Following the orders of Commander N'tho 'Sraom, Sehar fired upon the Sentinels. Although the ship managed to destroy several Retrievers, the constructs soon overwhelmed the ship. After Sehar lost control of the main cannons due to the Retrievers, 'Sraom ordered helmsman Zon 'Vadum to ram one of the constructs, leading to the corvette crash-landing on Installation 00.
While a team traveled to the Ark's Citadel, Sehar remained behind with most of the ship's crew to repair the damaged corvette. After Captain Annabelle Richards injured her leg and was forced to return to Mayhem, Sehar was tasked with utilizing medical technology to heal her injuries due to the lack of a Huragok aboard the corvette at the time. Eventually, the expedition team averted the firing sequence of the Halo Array and the crew of Mayhem were returned to Earth when the carrier UNSC Witness arrived at Installation 00 to assist the team.
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