Statistics for occurrence #1 of “U. S.” in chapter 5 of Thomas Wentworth Higginson, Massachusetts in the Army and Navy during the war of 1861-1865, vol. 2:

...Resigned, Aug. 19, 1862. Major, Surgeon, 15th Mass. Infantry, Aug. 5, 1861. Dismissed, July 17, 1862. Major, Surgeon, 12th Mass. Infantry, June 26, 1861. Major, Brigade Surgeon, U. S. Volunteers, Apr. 4, 1862. See United States Army. Major, Surgeon, 11th Mass. Infantry, June 13, 1861. Major, Surgeon, U. S. Volunteers, Aug. 3, 1861. See United States Army. F...
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