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:

...eutenant, Assistant Surgeon, 15th Mass. Infantry, Aug. 11, 1862. Mustered out, July 29, 1864. First Lieutenant, Assistant Surgeon, 7th Mass. Infantry, Aug. 14, 1862. Major, Surgeon, 37th U. S. Colored Infantry. See United States Colored Troops. Major, Surgeon, armed S. S. Cambridge, in service of State of Massachusetts, May 2, 1861, to July 20, 1861. Acting Assistant Surgeon, 2...
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