re: #489 pre-Boomer Marine brat

And when most people watch a movie like “Run Silent, Run Deep”, and see a officer spinning wheels on some big thing with lots of dials, do they have a clue as to what that was?

TDC - torpedo data computer. Allowed the sub to calculate where the torpedo should go based on the bearings, angle on the bow, calculated speed of the target, etc., and communicated the gyro angle to the torpedo.

Somewhere on the web are or were the technical manuals for the Fleet Boats.