Jock is part of the crew of the UNSC Leviathan at the time of the battle of Reach. He is one of the six Specialists assigned to the ship. He is the pilot of the Leviathan. His skills at the control of any aircraft are unmatched. He is quite selfcentered. He says he is lot of things, such as the coolest spartan on the team, the king of karaoke, etc. However he will just as quickly lay his life on line for one of the crew making him one thing he doesn't claim to be, a valuable member of the team.