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:

...Lieutenant, Assistant Surgeon, 2d Mass. Heavy Artillery, Nov. 9, 1863. Mustered out, Sept. 3, 1865. Major, Surgeon, 23d Mass. Infantry, Sept. 11, 1861. First Lieutenant, Assistant Surgeon, U. S. Volunteers, May 18, 1864. See United States Army. First Lieutenant, Assistant Surgeon, 1st Mass. Cavalry, Sept. 14, 1861. Major, Surgeon, 2d Mass. Cavalry, Nov. 13, 1862. Discharged (d...
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