1. United StatesThe United States Army dates back to 1775 when the Continental Army was created to fight in the Revolutionary War.
The U.S. Army has participated in every major world war, the Korean War, Vietnam, the Gulf War and the Global War on Terrorism.
The current active duty force for the U.S. Army numbers over 500,000 with a combined total of over one million with Reserve and National Guard soldiers.
The modern day Army is an all volunteer force with permanent posts throughout the United States as well as Germany, Italy, Kosovo, Japan and Korea.