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:

...tain, Dec. 15, 1862. Mustered out, Dec. 2, 1863. First Lieutenant, 39th Mass. Infantry, Aug.25, 1862. Resigned, Jan.24, 1863. Sergeant, 4th Infantry, M. V. M., in service of the U. S. , Apr. 16, 1861; mustered, Apr. 22, 1861. Mustered out, July 22, 1861. First Lieutenant, 22d Mass. Infantry, Oct. 1, 1861. Captain, July 10, 1862. Discharged (disability), Jan. 5, 1863. ...
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