The 17th Cavalry is a historical organization within the United States Army that began as a regiment of cavalry after the Pancho Villa Expedition. The unit was constituted on 1 July 1916 in the Regular Army as the 17th Cavalry at Fort Bliss, Texas and originally inactivated 26 September 1921 at the Presidio of Monterey, California. Formerly a part of the 1950s Combat Arms Regimental System, it was reorganized as a part of the United States Army Regimental System, an ongoing effort to maintain the lineage and history of the Army through its units. Today, the 17th Cavalry Regiment is found across the Army within the Combat Aviation Brigades, where the Squadrons, now constituted as attack/recon helicopter squadrons, carry on the legacy of the 17th Cavalry Regiment.