What measures support OPSEC when marking observed enemy activity?

• A. Limit precise sharing, use secure lines, and follow unit SOPs for marking and reporting.
• B. Publicly sharing enemy activity to keep team informed.
• C. Use open channels to speed reporting.
• D. Marking activity only after verification from higher command.

Answer: (A)

OPSEC hinges on keeping sensitive details about operations from leaking to the enemy. When you observe enemy activity and need to mark or report it, you should limit sharing to only what is necessary, use secure communication lines so messages aren’t intercepted or tampered with, and follow your unit’s standard operating procedures for marking and reporting. This combination protects locations, timings, and capabilities from becoming actionable intelligence in the wrong hands, while ensuring information is handled consistently and by authorized personnel. Publicly sharing enemy activity or using open channels would reveal critical details to adversaries; waiting for higher‑level verification before marking can delay crucial responses and still doesn’t replace the need for secure, controlled reporting and adherence to SOPs.