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:

...6. Sergeant, 10th Mass. Infantry, June 12, 1861. Captain, 36th Mass. Infantry, Aug. 22, 1862. Resigned, Apr. 22, 1864. First Lieutenant, 3d Infantry, M. V. M., in service of the U. S. , Apr. 23, 1861. Mustered out, July 22, 1861. First Lieutenant, 35th Mass. Infantry, Aug. 6, 1862. Transferred to 38th Mass. Infantry, Aug. 16, 1862. Resigned, Mar. 2, 1863. Fi...
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