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:

...scharged (disability), Mar. 25, 1864. First Lieutenant, Assistant Surgeon, 43d Infantry, M. V. M., in service of the U. S., May 5, 1863. Mustered out, July 30, 1863. Major, Surgeon, 35th U. S. Colored Infantry, Nov. 26, 1863. See United States Colored Troops. Major, Surgeon, 3d Battalion Riflemen, M. V. M., in service of the U. S., Apr. 19, 1861; mustered, May 19, 1861. Muster...
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