Statistics for occurrence #1 of “U. S.” in chapter 4, page 367 of Thomas Wentworth Higginson, Massachusetts in the Army and Navy during the war of 1861-1865, vol. 2:

...oned, First Lieutenant, Adjutant, 35th Mass. Infantry, Aug. 4, 1863. Captain, Sept. 6, 1864. Discharged, May 15, 1865. Second Lieutenant, 20th Unattached Co., M. V. M., in service of the U. S. , Aug. 11, 1864. Mustered out, Nov. 18, 1864. Second Lieutenant, 20th Unattached Co., Mass. Infantry, Nov. 19, 1864. Mustered out, June 29, 1865. Captain, 42d Infantry, M. V. M., in servi...
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