Here's an example of an S-boat crew, circa 1943 (I've added the job title; any Navy vet's please correct). This is the crew for S-44, may they rest in peace.
Sailors Lost On USS S-44 (SS-155) 10-7-1943
Beck, B. M. S1 (Seaman)
Biller, T. R. S1 (Seaman)
Brown, F. E. LCDR (Lt. Commander)
Butters. L. E. CCSA (Chief Commissary Steward's Apprentice)
Calvert, C. F. MOMM2 (Motor Machinists Mate)
Carrier, P. A. EM3 (Electricians Mate)
Cleverdon, T. CPHMA (Chief Photographer's Mate) or may be a typo for Chief Pharmacists Mate?
Cooper, T. O. S2 (Seaman)
Cutright, P. P. MOMM1 (Motor Machinists Mate)
Dillow, w. CMOMM (Chief Motor Machinists Mate)
Ellis, W. H. RM3 (Radio Man)
Erhart, W. E. S1 (Seaman)
Erico, D. B. CHBOSN (Chief Bosun)
Fees, R. R. MOMM1 (Motor Machinists Mate)
Ferrell, E. D. Y2 (Yeoman)
Gander, D. E. MM3 (Machinists Mate)
George, F. EM3 (Electrician's Mate)
Giles, F., Jr. MM3 (Machinists Mate)
Glenn, C. CK2 (Cook)
Gillen, F. E., Jr. S2 (Seaman)
Godfrey, E. W. MOMM2 (Motor Machinist's Mate)
Goodin, T. L. F2 (Fireman)
Green, L. J. F2 (Fireman)
Harasimowicz, A. CEM (Chief Electricians Mate)
Howard, H. J. MOMM2 (Motor Machinist's Mate)
Hugyo, N. A. MOMM1 (Motor Machinists Mate)
Jaworski, P. J. GM2 (Gunner's Mate)
Johnston, C. N. MOMM2 (Motor Machinists Mate)
Klink, L. N. MOMM2 (Motor Machinists Mate)
Miller, A. L. CMOMMA (Chief Motor Machinists Mate)
Mitchell, H. M. STM2 (Stewards Mate)
Morris, W. I., Sr. TM3 (Torpedoman's Mate)
Moss, C. E. GM1 (Gunner's Mate)
Nash, B. M. LTJG (LT Junior Grade)
Parr, T. S., Jr. SM2 (Signalman)
Queen, B. M. SC2 (Ship's Cook)
Queen, F. L. LTJG (LT Junior Grade)
Raugh, E. M. EM3 (Electrician's Mate)
Rodgers, R. G. MOMM2 (Motor Machinists Mate)
Rodin, L. J. S2 (Seaman)
Rosenberg, H. RM3 (Radioman)
Rubits, J. V. MOMM2 (Motor Machinists Mate)
Sloan, J. H., Jr. MM3 (Machinists Mate)
Smith, A. E. TM3 (Torpedoman's Mate)
Smith, C. W. EM1 (Electrician's Mate)
Smith, G. F. CSMA (Commissary Steward's Mate Apprentice)
Stephens, J. R. RM1 (Radioman's Mate)
Stephenson, J. T., Jr. LT
Stromsoe, H. A. CTM (Chief Torpedoman's Mate)
Thompson, D. R. MOMM2 (Motor Machinists Mate)
Turner, F. A., Jr. QM3 (Quartermaster's Mate)
Velebny, J. A. TM1 (Torpedoman's Mate)
Warburton, R. L. S1 (Seaman)
Watson, F. L. MOMM2 (Motor Machinists Mate)
Wester, G. S. S1 (Seaman)
Wood, J. C. F1 (Fireman)
Survivors
Duva, E. A. CTM (Chief Torpedoman's Mate)
Whitmore, W. F. RM3 (Radioman)
US Navy Interviewer's Classification Guide
http://www.history.navy.mil/library/...vpers16701.htm
(or in Air Force speak i.e., "job descriptions")
Yours, Mike