By 'chevrons' I assume you mean the red and white icons representing the crewman's job / specialty? In English 'chevron' usually refers to a V shaped rank insignia, like this:
I think the icons are mostly quite clear with a few exceptions. I've tried to guess what each of them is - if I get it wrong, maybe it is not clear enough:
- Torpedoes / weapons
- Maneuvering?? Dive control maybe?
- Steering or maneuvering
- Engines / propulsion
- Radio communications
- He plays the drums!
(I don't know this one)
- A diver
- Maybe a political officer?
I hope this helps. Keep up the good work!
