Louis Brandeis, United States v. Union Pacific Railroad Company…
“ Applicants for enlistment who have been accepted provisionally, but have yet to be subjected to the final examination at the recruiting depots and to take the oath before they become a part of the soldiery of the nation, are not 'troops of the United States.' It is the actual enlistment, the oath of allegiance, that changes the status from a civilian to soldier. ”
