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Because they're the oldest military branch Tun Tavern 11/10/1775 older than the U.S.A
Army
The United States Marine Corps was founded in Tun Tavern, Philidelphia, PA on November 10, 1775. The Marine Corps did not adopt "Semper Fidelis" as its motto until 1883.
The Battle of Lexington and Concord was the first armed conflict between British forces and the 13 colonies in North America. It was fought on April, 19, 1775 in the towns of Lexington, Concord, Lincoln, and Menotomy near Boston in Massachusetts. This battle heralded the era of open armed conflict between the Continental army and British forces.
Olive Branch Petition came first! Olive Branch Petition - 1775 Stamp Act - 1765
There have been armed forces for thousands of years. If you are talking about the armed forces of the USA, you could say they were in place before the nation existed. Militias were forming in the American colonies and fighting against the British army and navy in 1775. They represented Pennsylvania, New Jersey, or whatever colony they came from. The United States of America as a nation didn't really exist until later.
1775
The Olive Branch Petition was adopted by Congress in the year 1775
Infantry Branch - United States - was created in 1775.
The first fighting of the Revolutionary War broke out in Lexington and Concord, Massachusetts. On April 19, 1775, British soldiers confronted local militia in an attempt to seize weapons and supplies. This skirmish marked the beginning of the armed conflict between the American colonists and British forces.
The birthdate of the US Army is 14 June 1775. The birthdate of the US Navy is 13 October 1775, and it was disbanded in 1790, then re-established in 1797. The US Army is the oldest, and most continuous branch of the United States military (much to the dismay of the other three branches).
The United States Army is the oldest U.S. Military branch. It ties it's roots to the Continental Army, formed on 14 June 1775, before the establishment of the U.S.