Statistics for occurrence #1 of “U. S.” in chapter 5 of Thomas Wentworth Higginson, Massachusetts in the Army and Navy during the war of 1861-1865, vol. 2:

...ss. Infantry, July 24, 1862. Major, Surgeon, Apr. 24, 1863. Died in hospital at Chattanooga, Aug. 23, 1864. First Lieutenant, Assistant Surgeon, 42d Infantry, M. V. M., in service of the U. S. , Dec. 27, 1862. Mustered out, Aug. 20, 1863. Acting Assistant Surgeon, U. S. Navy, Oct. 28, 1862. Resigned, Feb. 4, 1864. First Lieutenant, Assistant Surgeon, 40th Mass. Infantry, Sept. ...
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