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:

... 1863. Resigned, May 2, 1864. Second Lieutenant, 1st N. Y. Engineers, Feb. 24, 1864. See Mass. Officers in Regiments of Other States. Captain, 8th Infantry, M. V. M., in service of the U. S. , Oct. 1, 1862. Mustered out, Aug. 7, 1863. First Lieutenant, Regimental Quartermaster, 3d Infantry, M. V. M., in service of the U. S., Apr. 23, 1861. Mustered out, July 22, 1861. ...
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