Fear of Aviation

The face of Su-25/37/57, F-117, and F-15/25 pilots when a 600-ton piece of junk rises from the water into the sky, accelerates to 3.5 Mach, rams everything in its path while having the armor of a tank or a ship, doesn't crash into rocks, and is equipped with homing missile weaponry.

The same goes for air defense and all anti-aircraft guns. It's one thing to try and catch up to it, but there are also tanks that accelerate to 7.8 Mach, carry weaponry just as deadly as that giant, and boast 10,000 HP with the armor of a next-generation main battle tank.