Fincher
From Halopedia, the Halo wiki
Private Fincher was a member of Corporal Harland's fireteam, which was part of a platoon commanded by Second Lieutenant McCasky. They were sent groundside during The Battle of Sigma Octanus IV.
When the squad came under attack from Covenant Hunters, Fincher grabbed the wheel of a Warthog and, with some help from the rest of the team, made it to safety.