Statistics for occurrence #1 of “U. S.” in chapter 4 of Thomas Wentworth Higginson, Massachusetts in the Army and Navy during the war of 1861-1865, vol. 2:

... 1864. Second Lieutenant, 29th Mass. Infantry, Apr. 20, 1861. First Lieutenant, May 21, 1862. Resigned, Aug. 26, 1863. First Lieutenant, 60th Infantry, M. V. M., in service of the U. S. , July 16, 1864. Mustered out, Nov. 30, 1864. See Mass. Field Officers. Second Lieutenant, 28th Mass. Infantry, Oct. 8, 1861. First Lieutenant, Dec. 3, 1861. Resigned, Dec. 3...
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