The largest and oldest branch of the United States Armed Forces is the United States Army.

Quick Scoop

  • The U.S. Army is officially described as the nation’s principal land force and is recognized as both the largest and oldest service branch in the U.S. Armed Forces.
  • It traces its origins to the Continental Army, established in 1775 during the American Revolutionary period, which makes it older than the Navy, Marine Corps, Air Force, Space Force, and Coast Guard as formal U.S. services.

So if you see a quiz asking “which branch of the military is the largest and oldest service in the United States Armed Forces?”, the correct answer is: United States Army.

Information gathered from public forums or data available on the internet and portrayed here.