According to ALMAR 008/17, which content should Marines refrain from posting in unofficial posts?

Marines are instructed to avoid posting content that could potentially jeopardize the morale and operational readiness of their unit because this type of information can affect unit cohesion and performance. Sharing details about the morale or readiness may inadvertently provide adversaries with insights into the unit's capabilities or reveal vulnerabilities that could be exploited. This guideline is in line with maintaining a professional image for the military and ensuring that sensitive information, which could compromise operational effectiveness or the well-being of the unit, is protected. By maintaining a focus on positive representation and avoiding negative narratives in unofficial communications, Marines help sustain an environment conducive to high morale and readiness.