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operations security
mil., logist.	The process which gives a military operation or exercise appropriate security, using passive or active means, to deny the enemy knowledge of the dispositions, capabilities and intentions of friendly forces. (FRA)
USA	A capability that identifies and controls critical information, indicators of friendly force actions attendant to military operations, and incorporates countermeasures to reduce the risk of an adversary exploiting vulnerabilities (JP 3-13.3) see also operations security indicators, operations security measures, operations security planning guidance, operations security vulnerability

operations security: 4 phrases in 2 subjects

Abbreviation	3
United Nations	1