Note: Communications security includes cryptosecurity, transmission security, emission security[?], and physical security of COMSEC material[?].
Source: from Federal Standard 1037C and from MIL-STD-188 and from the National Information Systems Security Glossary and from the Department of Defense Dictionary of Military and Associated Terms
... debate by finding Cepheids in Andromeda,
1930 - Robert Trumpler[?] uses open cluster observations to quantify the absorption of light by interstellar dust in the ...
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