Statistics for occurrence #1 of “U. S. A.” in chapter 36 of Rebellion Record: a Diary of American Events: Documents and Narratives, Volume 3.:

...rtant notice be taken of this very able and scientific officer by the War Department. I am, very respectfully, your obedient serv't, T. W. Sherman, Brigadier-General Commanding. Adjutant-General U. S. A. , Washington, D. C. flag-ship Wabash, off Hilton head, Port Royal harbor, November 6, 1861. Hon. Gideon Welles, Secretary of the Navy, Washington: sir: The Government having determined...
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