Oisin Finney

"I missed by chance once. I won't miss it again."

- Finney on becoming a Spartan

, originally born Oisin Shaughnessy, and briefly known as Oisin-B2222, was a UNSC soldier, eventually serving in Blackjack Company as an NCO. Orphaned during the bloody Outer Colony sieges, he was recruited into the Spartan-III program, during the Beta Company intake. He proved to be a capable team leader, and lead Team November to several victories in training. However, he suffered a catastrophic injury, and missed the augmentation procedures. He was steadily left behind, as his newly augmented team moved onwards, and upwards, before embarking on Operation TORPEDO. Oisin was racked with guilt when his team died, convinced he may have been able to save them, and complete the mission, and became bitter towards the survivors, Tom and Lucy.

ONI 'recycled' his identity, creating a new cover identity, and he became a Drill Instructor for Gamma Company. At this point, he was bitter, and angry, seemingly taking it out on recruits, but he was determined these Spartans wouldn't suffer the same fate Beta did, and pushed them hard. When Gamma company's training was complete, he'd heard rumours of a Spartan-IV program, and begged Lieutenant Command Ambrose and Colonel Ackerson to give him a chance to apply. Strings were pulled, and he got the opportunity to apply, successfully passing fitness and technical requirements, but narrowly passing the psychological testing.

Oisin became a Spartan-IV, and many of his colleagues saw him as bigger, and meaner, than most of the regular fours. He would hold a number of team leader rolls, before Spartan Ops was rolled into the revitalised Spartan Corps, and became an NCO in Blackjack Company.