 Unlike armoured and infantry units, U.S. Cavalry is organized into squadrons and troops, which are equivalent to battalions and companies respectively.A regiment of armoured cavalry, such as the 11th Armored Cavalry Regiment (the "Black Horse" Regiment) in Vietnam, consisted of three full squadrons of armoured cavalry.The squadron normally consisted of a headquarters troop, three cavalry troops, a tank company, a 155-mm self-propelled howitzer battery, and an aviation troop.