A Senior Chief Petty Officer (SCPO) is a senior non-commissioned officer rank in the United States Navy and United States Coast Guard. This rank is above Chief Petty Officer and below Master Chief Petty Officer. SCPOs typically have significant experience and leadership responsibilities, overseeing junior personnel and managing various operations within their units. SCPOs play a crucial role in training and mentoring sailors, ensuring that they meet the standards of their respective services. They are often involved in decision-making processes and serve as a vital link between enlisted personnel and commissioned officers, contributing to the overall effectiveness of military operations.