4.21 DOD 5220.22-R, Industrial Security Regulation, December 1985.
Definitions immediately follow the table of contents.
DOD DII circuits requested under the provisions of this Circular will be operated and maintained in accordance with the provisions of the references listed in paragraph 4 . The changes are reflected by red italic text. T4.4A, T4.4B have been added and updated. Any parts of this Circular not changed will have a 4 April 2000 date at the end of the file.