Each job has its own unique title—such as Boatswain’s Mate 2nd Class Jones—and an insignia denoting the rating included on his or her uniform.
What makes the system so confusing is the constant creation of new jobs, the merging of jobs or eliminating them entirely as the service requires.
For example, in the last several years the Navy has created ratings for unmanned vehicle operators and cyber-warfare technicians while losing or merging jobs such as patternmaker and boiler technician.
The following is a collection of former Navy ratings (and one defunct officer rank) made mostly obsolete by advances in technology and occasionally by more modern stances on race, gender, and—at least in one case—child-labor norms.
A fun little piece.