Which rank corresponds to the abbreviation SN?

The abbreviation SN corresponds to Seaman, which is a rank within the U.S. Coast Guard. In the military ranking system, Seaman is typically above the initial entry-level rank, indicating that the individual has advanced from that entry-level stage and has begun to gain experience and responsibility.

Seaman Recruit, while closely related, is a lower rank and corresponds to the entry-level training stage before advancing to Seaman. Specialist Navigator and Submarine Navigator are not recognized ranks within the U.S. Coast Guard nomenclature, making them irrelevant in this context. Thus, understanding the structure of ranks in the Coast Guard clarifies why Seaman is the correct interpretation of the abbreviation SN.