Which of the following is the abbreviation for Operations Specialist?

The abbreviation for Operations Specialist is OS. This acronym is widely recognized and commonly used within the United States Coast Guard and other branches of the military. The simplicity of the two-letter abbreviation makes it easy to remember and use in various contexts, ensuring clear communication among personnel.

In contrast, the other options either do not accurately represent the official designation or are not as widely accepted. They may be misleading or overly complex, which could lead to confusion in professional or training settings. The preferred and standardized abbreviation, OS, provides clarity and consistency across communications related to this specific naval rating.