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:

...st Lieutenant, Assistant Surgeon, 7th Mass. Infantry, May 27, 1862. Major, Surgeon, Sept. 10, 1863. Mustered out, June 27, 1864. Major, Surgeon, 53d Infantry, M. V. M., in service of the U. S. , Dec. 15, 1862. Mustered out, Sept. 2, 1863. First Lieutenant, Assistant Surgeon, 4th Mass. Cavalry, Mar. 1, 1864. Discharged (disability), Apr. 23, 1864. First Lieutenant, As...
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