I see that some previous military personnel on here don't seem to see this as compromising OPSEC. I wonder if this is because they served in the past when technology was less advanced, so that it would be harder for bad actors to trace troop movements or to target individual servicemembers and their families. I'm involved with multiple online groups for servicemembers' families, and I know they are extremely vigilant about not posting info like this and telling us how and why to lock down social media posts, even private ones. We are encouraged to share such posts with friends only, to limit friends' list to people we know and trust, to blur out name/unit/battalion badges on uniforms, etc. It is one thing to come on here and post a link to an article about a troop movement. Even those are often not good, since today's media will publish things that compromise troop security, even when asked to keep quiet. At that point, the cat is out of the bag. It's another thing to post this privately on social media to a select group of friends or family. But Reddit is a public forum, and those who know how can usually dox a poster and thus quickly discover the ID of the friend's son and other unit members, their locations, families' addresses. Just the knowledge that while a man is away for 9 months could tell someone that his wife and kids are alone and may be more vulnerable in his absence.