Canonically, he's an ensign without portfolio.
I had to look that up.
Oh, I don’t think there’s any danger of that.Well you're more educated than I am,
Worf's S1 job was supposed to be Officer of the Deck, a very real and legitimate job in navies of today. Basically, they're the officer directly in charge of the bridge, and if the Captain or XO have a problem with how the bridge is run, the OOD (as it's abbreviated to) is the one who answers for it.Maybe Jack could have the position Worf held during S1 of TNG -- he was basically a bridge relief officer who stayed on the bridge all throughout his shift and took over at major console stations if the regular officer was called away. He would also sometimes stand in as officer of the watch if the regular members of the chain of command were unavailable.
Worf's S1 job was supposed to be Officer of the Deck, a very real and legitimate job in navies of today. Basically, they're the officer directly in charge of the bridge, and if the Captain or XO have a problem with how the bridge is run, the OOD (as it's abbreviated to) is the one who answers for it.
The job typically gets ignored in Star Trek or anything set on a ship in general due to a desire to be narratively streamlined. TNG only used it in S1 because Worf was a late addition to the cast and all the other positions were already occupied, which is why they seem to treat the job as an afterthought. For TNG's S1 writers, it literally was an afterthought.
Since they were not called Marines as such in those films it doesn't make it more likely. Intent is fine and all but it runs counter to what's actually presented on screen.
Still sounds too senior for Jack then. (Memory Alpha only lists Worf's job as relief bridge officer though -- no mention of being OOD.)