I was curious if there were "boot camps" during the CW and found this:
In the Regular Army, before, during and after the Civil War recruits received only rudimentary training at there post where they entered the service – consisting of barracks and personal housekeeping and the beginnings of close order drill. The real training came when they joined their permanent unit. Training was principally a matter handled by the company officers and sergeants and corporals on an "On the Job" basis that involved no small amount of physical guidance in awkward squads or Good Old Company Q.
Volunteer units during the Civil War received their training very much on a blind leading the blind basis since nobody knew much of anything, from the basics of camp sanitation to musketry to battlefield maneuver. It was the fortunate unit that had an old soldier who at least knew what was expected and how things were done. US Grant got his start as a regimental commander because he had a background that could be used to shape up an Illinois regiment that had suffered under inexperienced leadership. Generally, however, the privates NCOs and officers learned together – in a good unit the officers were a chapter ahead of the NCOs and the NCO were a chapter ahead of the privates. For the first month or so those volunteer regiments were just a big school where the teachers were as ignorant as the students.
and:
Boot camps did exsist in America during the 19th century. Duing the Indian Wars:
Upon volunteering troops were sworn in, given a phisical exam, and a bath.
There were three "recruit depots" one in David's Island New York, another at Columbus Barraks Ohio and one at Jefferson Barraks Missouri. The first two were for infantry the last for the cavalry.
At the depots the new soldiers were given uniforms and taught the basics of the Army system, basic drill, and how to care for themselves in the field.
The process lasted anywhere from a few weeks to several monthes. They were then sent to a unit where training continued.
While not nearly as systematic or as rigorous as the present system it did exsist.
My information comes from "The Enlisted Men of the Indian Wars" by Don Rickey Jr. and was published in Military Affairs Vol.23 No.2