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| - Organized 31 October 1836 in the Massachusetts Militia at Boston as the National Lancers
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| - Reorganized and redesignated 5 October 1852 as Troop A (National Lancers), 1st Battalion of Light Dragoons
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| - While remaining in state service additionally organized Companies C and D, 1st Massachusetts Volunteer Cavalry, mustered into Federal service 1 November 1861 at Readville; mustered out of Federal Service 26 June 1865 at Washington, D.C.
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| - Reorganized and redesignated 20 August 1864 as Troop A
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| - Reorganized and redesignated 27 March 1865 as Troop A, 1st Battalion of Cavalry
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| - Reoganized and redesignated 19 May 1906 as Troop A, 1st Squadron of Cavalry
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| - (Massachusetts Volunteer Militia redesignated 16 November 1907 as the Massachusetts National Guard)
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| - Mustered into Federal service 22-27 June 1916 at Framingham; mustered out of Federal service 18 November 1916 at Boston
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| - Mustered into Federal service 3 August 1917 at Framingham; drafted into Federal service 5 August 1917
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| - Reorganized, redesignated and converted 18 August 1917 as Company A, 102nd Machine Gun Battalion and assigned to the 26th Division
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| - Demobilized 29 April 1919 at Camp Devens, Massachusetts
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| - Reorganized 24 June 1920 as the National Lancers, an independent unit, and Troop A, 1st Separate Squadron of Cavalry (hereafter separate lineage)
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| - Reorganized 6 July 1964 in the Massachusetts Organized Militia as the National Lancers
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