Watch the AI tanks do battle (fullscreen recommended, sound up!) or PROGRAM YOUR OWN and add it to the project! The tanks are fairly simple to program (see inside the Sprite called "Remix This" for instructions) and see tutorial at https://scratch.mit.edu/projects/200761604/ and https://scratch.mit.edu/projects/71210466/ for more Hints and Tips (although this is for the old project). Share your remixes and I'll add your tank to this project. Let me know if you need more help.
Please add Selesnya and Eternal