1866 - 28 July: Constituted in the Regular Army as the 7th Cavalry Regiment.
1866 - 21 September: Organized at Fort Riley, Kansas, Colonel Andrew J. Smith,
1883 - Circulars 8 and 9, Adjutant Generals Order of 1883 officially change the
designation U.S. Cavalry companies to Troops and battalions to Squadrons.
1917 - December : Assigned to the 15th Cavalry Division.
1918 - 11 May: Relieved from the 15th Cavalry Division.
1921 - 13 September: Assigned to the 1st Cavalry Division.
1943 - 28 February: Dismounted.
1943 - 4 December: Reorganized partly under cavalry and partly under infantry
tables of organization and equipment.
1945 - 20 July: Reorganized wholly as infantry, but retained cavalry designations.
1949 - 25 March: Reorganized with troops designated as companies
1957 - 15 October: Relieved from the 1st Cavalry Division
1957 - 01 November: Reorganized as a parent regiment under the Combat Arms Regimental