Historical Crew
 

I was wondering... what was the historical crew complement of an american sub?
How many Commisioned officers and NCO vs sailors?
Also, did the engine room had a dedicated commisioned officer (like a chief engineer)?

there were about 70 non comms on the boat and about 10 officers, I am not sure about the officer in the engine room, however I do not think so since their was two engine rooms on each sub. I believe the crew were just highly and I emphasize highly skilled, since each man had a specific job. The engineering officer might be in charge of the general maintenance but he was not stationed there.

In the US Navy, unlike the Royal Navy and others, the Engineeering Officer on any ship, including submarines was a "line officer" that could eventually achieve command. On board a fleet boat he would usually be the third or fourth most senior officer after the CO, XO and, if assigned, the Navigator (the XO often functioned as the Navigator). The Engineering Officer would stand regular watched as an Officer of Deck (OOD) and would be the ships Diving Officer at Battlestations. He would have either a first class petty officer or chief pettty officer as the senior enlisted electrical rating and Motor Machinist/Engineman rating. A first class rating would stand watch in the engineering spaces (Manuvering or one of the Enginerooms). A chief would probably stand watch as Chief of the Watch (COW) in the Control Room"