Vermonters served in a variety of regular army organizations aside from Vermont Volunteer units and volunteer units from other states. The 1892 Revised Roster provides short biographical sketches of many of these. Included are a number of native Vermonters who attained the rank of Brigadier-, Major- or Lieutenant-General while serving in U.S units.
In addition, a number who enlisted in Vermont units, later transferred to regular U.S. Army Units. This information may be valuable when trying to find additional materials from the National Archives regarding your ancestor's service.
There are also a number of men who either enlisted in the Veteran Reserve Corps, either directly, or from a unit in the field.
Finally, there were a number of men recruited directly into the U. S. Army, and veterans who enlisted in Hancock's First Army Veterans.
NOTE: Although technically a U.S., not Vermont unit, the Sharpshooters were recruited in companies by State, so we have treated them as Vermont units.