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:

.... Infantry, Aug. 23, 1861. Major, Surgeon, 12th Mass. Infantry, May 26, 1863. Mustered out, July 8, 1864. First Lieutenant, Assistant Surgeon, 42d Infantry, M. V. M., in service of the U. S. , Nov. 11, 1862. Mustered out, Aug. 20, 1863. First Lieutenant, Assistant Surgeon, 10th Mass. Infantry, June 21, 1861. Major, Surgeon, 18th Mass. Infantry, Jan. 13, 1862. Mustered out, ...
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