The US military has a hierarchical rank structure with different levels of responsibility and authority. The US Army, Navy, Marine Corps, and Air Force each have their own ranking system, with similar names and responsibilities but with slight differences. The highest rank in each branch is a General (Army/Marine Corps) or Admiral (Navy) or General (Air Force). The lowest rank is typically Private (Army/Marine Corps) or Seaman Recruit (Navy) or Airman Basic (Air Force). https://usmilitary.com/military-ranks-for-army-navy-marines-and-air-force/