Part 7. SYSTEM OPERATIONS SECURITYChapter 21. Operations Security: Tactical, Special, and StrategicSection 1. Organizational MissionsSection 2. ResponsibilitiesSection 3. Operational Line of AuthoritySection 4. Supplemental DutiesSection 5. CoordinationSection 6. Special Security Instruction (SSI) (14 CFR Section 99.7)Section 7. Security Notice (SECNOT)