Final answer:
The Chief of Naval Operations (CNO) and Commandant of the Marine Corps (CMC) are required to submit a report of combat decorations awarded on an annual basis.
Step-by-step explanation:
The question how often the Chief of Naval Operations (CNO) and Commandant of the Marine Corps (CMC) must provide a report of combat decorations awarded pertains to procedures within the U.S. military. According to the guidelines and regulations that govern military operations and reporting, these reports are typically required to be submitted annually. Unlike some other reports that might be needed more regularly or in special circumstances, the reporting of combat decorations is a formal process that summarizes the recognitions given over a full-year period.