Learn more about Navy enlisted rates and Coast Guard enlisted rates. What Is the Highest Military Rank? Generally, the highest U.S. military rank is O-10, or a four-star general.

The Navy also announced time-in-grade waivers for senior enlisted sailors in ranks E-7 through E-9, and officers in grades 0-5 and 0-6. Those individuals with 20 years of service can apply for a ...