Jack was once happily married with seven children...
Seriously, he's a robot. But that doesn't change the fact that Jack is a key member of Delta Squad.
If a door needs ripping or a computer needs hacking, Jack is there to help. Remaining in a cloaked state during battle, Jack only appears when necessary.
Recent upgrades have outfitted Jack with a slide-out monitor so command may communicate with the squad through video.
Jack is known to have a serious drinking problem.