You won't get banned, not at all. At least, I can't understand why you would be.
But you can understand the reason why people tread carefully? It's not just to give people credit about their insight, it's really to weed out the people who use it as an excuse to lord it over others. i.e if they have an opinion that differs from someone else, they throw down the "prior service, all your arguments are inferior to mine" thing. Those are the guys we want to root out.
From an enthusiasts point of view (i.e like me, no defence industry links or service history), there's nothing more useful or interesting than talking to a blue (what you'd become - Defence Professional) about what they know about defence tech within reason, far more useful than the vast majority of internet info.