Columbia subject headings:
Draft--Law and legislation--United States.
Internal security--United States.
Harvard subject headings:
Draft--Law and legislation--United States
Internal security--United States
Loyalty oaths--United States.
Military discharge--United States.
Security clearances--United States.
Subversive activities--United States
United States. Army--Recruiting, enlistment, etc.
United States. Army--Regulations.
Princeton subject headings: