As I work with the data from the Sailor Database I have been noticing trends, It’s faster to be promoted as a Fireman 3rd class than to a Seaman 1st class. In fact if your selected to be a fireman, you’ll be promoted six times faster on the Boston in world war II as a fireman than to a Seaman 1st class. The promotion time from Seaman 1st Class to Coxswain is about twice as long as the path from Fireman 3rd class to Fireman 2nd class. So Seaman 2nd class sailors selected to be Firemen can have 4-6 promotions in 2 years, where sailors slotted for Seaman 1st class will have on average 1-2 promotions.
Bill