Additional material for Compiled Military Service Records for Pennsylvania, Massachusetts, Wisconsin, and Veterans Reserve Corps. Index to General Correspondence of the Record and Pension Office, microfilm M686, under state, arm, then regiment number. Court-martial proceedings, indexed on microfilm M1105, by name of accused, showing regiment. Medal of Honor files, indexed by name of individual, with unit shown. For U.S. Colored Troops regiments, Ira Berlin, et al. , ed.
Additional possibilities are almost endless.
Many sources given for Union volunteer regiments also cover regular units. The equivalent for regulars of the Volunteer Service Register is the Army Register , issued yearly, 1860-1866. All regular officers of the nineteenth century are in volume 1 of Francis B. Heitman, Historical Register and Dictionary of the U.S. Army . . . , and all West Point graduates in George W. Cullum, Biographical Register . . . of the U.S. Military Academy . Monthly returns on microfilm. Record Group 391. 4.