Statistics for occurrence #1 of “U. S. A.” in entry d.-s.-miles of Frederick H. Dyer, Compendium of the War of the Rebellion: Name Index of Commands:

...xhtml1/strict">  To July 25, 1861.  Col. 2d U. S. InfantryJuly 22, 1862, to Sept. 14, 1862.  Col. 2d U. S. InfantryMarch 22, 1862, to July 22, 1862.  Colonel U. S. A.   
...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.