In Season 1 O"Brien mostly seemed to be in a red shirt putting him in the "command" jobs which seems to include navigation. What we later know about his rank it's possible at this time he's just a Petty Officer given the grunt work to do. The 24th century equivalent of swabbing the decks. (Or cleaning the holodeck after Riker gets done in there.)
In S2 he's seems to have gained a promotion to Chief Petty Officer and switched to the Operations department where he oversaw transporter duties. I personally wondered at times if he wasn't also the Enterprise's COB.
In 10110010 (or whatever) he wasn't on the ship but had left with Yar and Worf to play Parisi Squares.
In S2 he's seems to have gained a promotion to Chief Petty Officer and switched to the Operations department where he oversaw transporter duties. I personally wondered at times if he wasn't also the Enterprise's COB.
In 10110010 (or whatever) he wasn't on the ship but had left with Yar and Worf to play Parisi Squares.