Cavalry Charge Poster Art. The United States Cavalry, was the designation of the mounted force of the United States Army by an act of Congress on 3 August 1861. This act converted the U.S. Army’s two regiments of dragoons, one regiment of mounted riflemen, and two regiments of cavalry into one branch of service. Air Cavalry is a US Army term that refers to helicopter equipped units that perform reconnaissance, security, and economy of force missions. The Vietnam War saw the introduction of helicopters and operations as a helicopter-borne force with the designation of Air Cavalry, while mechanized cavalry received the designation of Armored Cavalry. Today, cavalry designations and traditions continue with regiments of both armor and aviation units that perform the cavalry mission. The 1st Cavalry Division is the only active division in the United States Army with a cavalry designation. The division maintains a detachment of horse-mounted cavalry for ceremonial purposes
