Harder, more complex models.....

Star Destroyer - https://www.fi.edu/tfi/info/current/inline/destroyer.jpg

UFO - ?????

Futuristic Tank - https://ghoul.flipcode.com/3dm/tank-m.../tank-01-1.jpg

Regular Tank - https://www.mos.org/sln/Leonardo/tank.gif

Thomas the Tank - https://www.kxtv.com/images/Community...e-tank-266.jpg

Helicopter - https://static.howstuffworks.com/gif/...icopter-40.jpg

Digital Camera - https://www.businesscomputersystem.co...tal-Camera.jpg