What should never be posted on social media according to unofficial post guidelines?

The guideline that emphasizes never posting classified or sensitive information on social media is critical for maintaining operational security and protecting the integrity of military operations. Sharing classified or sensitive information can expose vulnerabilities, jeopardize missions, and put the safety of personnel at risk.

The importance of operational security cannot be overstated in a military environment, where preserving the confidentiality of tactical strategies and intelligence is paramount. Such information, if leaked, can be exploited by adversaries, leading to potentially devastating consequences.

While the other options may carry some risks regarding professionalism or appropriateness, they do not hold the same level of urgency and potential danger as classified or sensitive information. Thus, the guideline focuses specifically on the necessity of safeguarding information that could impact national security.