Which of the following is a crew rating for outstanding performance?

The designation of "Distinguished" as a crew rating signifies an exceptional level of performance by the crew. This rating is awarded when the crew has demonstrated remarkable proficiency, professionalism, and effectiveness in their operations. Achieving a Distinguished rating often reflects a combination of factors, including successful completion of tasks, adherence to safety standards, and the demonstration of teamwork and skill under operational conditions. This rating not only recognizes individual contributions but also highlights the crew's ability to work cohesively, leading to outstanding mission results.

In contrast, the other ratings do not convey a standard of excellence. "Failed" indicates an inability to meet performance expectations, while "Qualified" signifies meeting minimum performance standards without necessarily excelling. "Unqualified" denotes a lack of sufficient skills or competencies required for the task at hand. In this context, "Distinguished" distinctly stands apart as a testament to outstanding crew performance.