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:

...ee United States Army. First Lieutenant, Assistant Surgeon, 2d Mass. Cavalry, July 26, 1864. Mustered out, July 20, 1865. Major, Surgeon, 6th Infantry, M. V. M., in service of the U. S. , Sept. 4, 1862. Mustered out, June 3, 1863. Major, Surgeon, 6th Infantry, M. V. M., in service of the U. S., July 20, 1864. Mustered out, Oct. 27, 1864. First Lieutenant, Assistant Sur...
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