Jack was a former marine of 14 years. He is now happily married to Rainbow Dash.
He has the honor of being the of Luna and Celestia, as well as the lost Prince.
Along with an old friend, he saves Equestria.
But with everything good, there is something bad.
Go look at a half-decent story. You'd be wasting your time here.

Jack is a former Marine, after 14 Years in the Corps, he is transported into the The MLPVerse with only his Trusty combat Knife, and his clothing.
Yep. HiE Fic. And I know it kinda Sucks, so, Yeah.