Statistics for occurrence #1 of “U. S.” in chapter 4, page 283 of Thomas Wentworth Higginson, Massachusetts in the Army and Navy during the war of 1861-1865, vol. 2:

...17, 1865. First Lieutenant, 12th Mass. Infantry, Aug. 11, 1862. Captain, Dec. 21, 1862. Mustered out, July 8, 1864. Second Lieutenant, 55th Infantry, M. V. M., in service of the U. S. , Oct. 17, 1862. Regiment consolidated with 48th Infantry, M. V. M., in service of the U. S. Mustered out, Dec. 15, 1862. Second Lieutenant, 8th Battery Mass. Light Artillery, June 16, 1862...
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