Understanding the ranking systems across the military branches

Heads up, bit of an unusual question coming through: Could anybody here give me an idea about the highest ranks across each military branch? I've tried looking stuff up myself, but the results are a bit jumbled and unclear. I'd love to hear about the top ranks in the Army, Navy, Air Force, and Marines - and how each of their ranking systems compare. Much appreciated!

Sure, I can help with that. Each branch of the U.S. military has a different ranking structure, but I can certainly list the highest few ranks for each of them.

In the Army, from lower to higher, the top ranks are Major General (two stars), Lieutenant General (three stars), General (four stars), and General of the Army (five stars, but it's a wartime rank and not currently in use). The Marine Corps follows the same ranking structure.

In the Air Force, the top ranks are also Major General (two stars), Lieutenant General (three stars), and General (four stars). Like the Army, the Air Force has a five-star rank called General of the Air Force, but it is only used in a time of war.

The Navy, on the other hand, has a different system. From lower to higher, their top ranks are Rear Admiral (lower half, one star), Rear Admiral (upper half, two stars), Vice Admiral (three stars), Admiral (four stars). The rank of Fleet Admiral (five stars) exists but is only used during wartime.

In a nutshell, each branch does have general and admiral positions but the titles and insignia differ. Still, each major rank generally corresponds in terms of authority across all branches. Two-star generals and admirals oversee major units, three-stars typically have higher command at the service component level, four stars lead the service's global efforts, and five-stars (in wartime) have broad, often multi-service or joint command authority. I hope this overview helps!