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:

...s. Infantry, Apr. 15, 1862. Major, Surgeon, 28th Mass. Infantry, May 27, 1863. Mustered out, July 22, 1865. First Lieutenant, Assistant Surgeon, 6th Infantry, M. V. M., in service of the U. S. , Sept. 4, 1862. Mustered out, June 3, 1863. First Lieutenant, Assistant Surgeon, U. S. Volunteers, Aug. 7, 1863. See United States Army. First Lieutenant, Assistant Surgeon, 8th Infantry...
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