The United States Army was established on June 14, 1775.
The Second Continental Congress created the Continental Army during the opening year of the American Revolutionary War. The modern United States Army traces its institutional history to that action, making June 14 its birthday.
In 2025, the Army marked its 250th anniversary with a parade and celebration in Arlington, Virginia, and Washington, D.C. The event was connected to the broader America250 period because the Army’s anniversary fell one year before the national semiquincentennial.
June 14 is also Flag Day in the United States. The Army’s founding date therefore has a separate military significance from July 4, 1776, the date associated with the Declaration of Independence.