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:

...tenant, Assistant Surgeon, 19th Mass. Infantry, Mar. 19, 1863. Dismissed, Dec. 2, 1863. Acting Assistant Surgeon, Mar. 1, 1862. Major, Surgeon, 45th Infantry, M. V. M., in service of the U. S. , Oct. 28, 1862. Mustered out, July 7, 1863. First Lieutenant, Assistant Surgeon, U. S. Volunteers, Sept. 2, 1863. See United States Army. First Lieutenant, Assistant Surgeon, 1st Mass. H...
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