Personally, I use an engineer, planesman, and sonarman in the support slots, overheat time and speed are 2 of the most important things for playing SS. I also have gunners on the R slots for the flak guns but most people DON'T use them. If you want repairmen on your sub, best option is to put them on the gun slots of your sub since you have 2 and probably arn't planning on using the flak guns. Free support slots should always give priority to engineers since those are the only slots they work in. Repairmen work anywhere.
So long and short, 1 engy in support slot and 2 reps on gun slots
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