This is 3 new heavily armored units that I made for humans faction: Tank-drone, Artillery MLRS system and Anti-aircraft defensive system. They are all based on amphibious undercarriage but have very different characteristics and combat assignments.

Tank Drone

 Tank Drone is an unmanned, heavily armored fighting vehicle with tracks and a rail cannon that is designed for front-line combat. Tanks are mobile land weapon platforms, mounting a large-calibre cannon in a rotating gun turret. They combine this with heavy vehicle armor, and operational mobility. This unit is effective against large armored targets but not effective against infantry, due to the low rate of its cannon.

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