Given the following context:  When contact with the USG Ishimura and the Aegis VII colony is lost, the Concordance Extraction Corporation sends the ship USG O'Bannon to investigate, but contact is lost with them as well. The Marine battleship Abraxis is sent next. Despite the carnage of Dead Space, four survivors are found: Nicholas Kuttner, a security officer; Alejandro Borgas, an engineer; Nolan Stross, chief science officer; and Isabella Cho, chief medical officer. The survivors are imprisoned in a holding cell while the ship is en route to the Sprawl, a station built on a shard of Titan. The head interrogator is told by the Overseer he has seven hours to get information from the survivors. Kuttner is interrogated first and gives his account of the events: he, Cho, Borgas, and Stross are assigned by the O'Bannon's commanding officer to stabilize the gravity on Aegis VII. Assisting are soldiers Rin and Sergenko, along with two additional engineers, Borgas' cousins Noah and Omar, a Unitologist. Campbell secretly tasks Kuttner's crew to bring back pieces of the Marker, which are worth millions of credits per kilo. The group land on Aegis VII, which is now unstable. While the engineers work the gravity stabilizer, Kuttner's crew separate. Kuttner finds a Marker shard, which causes a horrifying hallucination, making him murderously unstable. He damages the stabilizer before his teammates can tie him up in the shuttle. After finishing his interrogation Kuttner is able to escape and follows a phantom of Vivian out of an airlock, killing several marines.  answer the following question:  What ship does the murderously unstable man hail from?
USG O'Bannon