Either rocks on Mars take on a variety of odd shapes, thanks to shadows and angles, or some alien someone is really enjoying a good joke. Even if our "Solar Warden" space fleet, if it exists, is on Mars, they wouldn't have 20th Century tanks with cannons and turrets. The only other possibility, our entire reality is not what we know it to be.
I am not being disrespectful here but I have yet to see a photo from mars that I could really believe. We can't draw conclusions from what we see here! NASA would never allow anything revealing to be released even if they had photographed something significant. There is a coverup on the truth we all know and sense that. Mars is a great mystery but these pictures offer no more than noticing animal shapes in clouds does. Keep sending them in Christian...One day we may get a scoop!