Bluejackets are often referred to as sailors. This term actually comes from the uniform worn by sailors, which traditionally features a navy blue jacket. Other synonyms for bluejackets include mariners, seamen, deckhands, and crewmen. Many of these terms are gender-neutral and refer to both men and women who work aboard ships. Other terms may be more specific to certain types of sailors, such as submariners who serve on submarines, or naval aviators who fly aircraft from carriers. No matter what the term, bluejackets play a critical role in the maritime industry and help ensure that goods and people are transported efficiently and safely across the world's oceans.