Statistics for occurrence #1 of “U. S.” in chapter 3 of Thomas Wentworth Higginson, Massachusetts in the Army and Navy during the war of 1861-1865, vol. 2:

... First Lieutenant, 34th Mass. Infantry, Aug. 12, 1862. Transferred to 36th Infantry, Aug. 22, 1862. Captain, Aug. 2, 1863. Promoted Aide-de-Camp to General Curtin, Oct. 9, 1864. Brevet Major, U. S. Volunteers, Apr. 2, 1865. Mustered out, June 8, 1865. See General Officers. First Lieutenant, 16th Mass. Infantry, Aug. 1, 1861. Captain, July 6, 1862. Major, 2d Mass. Heavy...
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