Definitely built in a 3D program.
You could fake some of the effects in AE but it would take investing in some plugins like Element (for the 3D tank, which you would also have to buy). And maybe Mir for the landscape.
Cinema 4D probably would be the more effective tool to use, but with some great skills and creativity you might pull it off in AE with the plugins I mentioned.
Tom Daigon
PrP / After Effects Editor
http://www.hdshotsandcuts.com
https://www.youtube.com/watch?v=XRIg6h-LIm0 (Best viewed at 1080P and full screen)
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