Battle Group Omicron
From Halopedia, the Halo wiki
Battlegroup Stalingrad was a UNSC Naval Battle Group.
Background
It was comprised of nine ships and commanded by Admiral Carl Patterson. In 2552, it was deployed to Onyx to retrieve Dr. Halsey, a joint unit of SPARTAN-IIs and SPARTAN-IIIs, and (supposedly) examples of Forerunner technologies that had been excavated. However, before it could carry out this task, it was engaged and eventually defeated by a superior Covenant fleet at the Battle of Onyx. Only the UNSC Dusk survived.
