Which is the oldest US military service?

Answer 1

Interesting question! I am not sure if you mean military unit or something a bit broader, so I'll assume you meant individual unit. If I am incorrect, please let me know.

According to the Military History website, one of the oldest continuous military units in the world is the Swiss Guard at the Vatican. Formed in 1506, that would make the Swiss Guard 500+ years old.

While not the oldest the Scots Guards were formed in 1642 and have fought in every major British conflict since it was created.

The Swedish Dragoons date back as far as 1523

I'm sure there are more, but these three give you a starting point for any research you might want to do.

Added: The Yeomen of the Guard were formed in 1485.

Answer 2

The United States Coast Guard is the oldest continuous of the United States 5 armed military branches. In 1790 the Revenue Cutter Service was formed and as time goes on additional responsibilities were added such as the Lighthouse Service

While the Army can trace itself back to the revolutionary war it was disbanded once independence from the British was gained and not until 1798 was it re-established.

Answer 3

The Army is the oldest United States of America service.

With all due respect if you base the information on the birth of the United States on July 4th, 1776, the Continental Army, Navy & Marines were disbanded and the first Armed Military Service formed by the NEW UNITED STATES OF AMERICA was the Revenue Cutter Service, the Original name of the Coast Guard.