Reason:
*Armor
*Giant Cannon
*Wheels
*Treads
*Larger Size
*Trumps All forces (Ants can't even stop birds, well they can but that's only in a group.)
*Cutting Edge Tech (It's basically the super enhanced version of hive mind advancements, this one makes Ant's tech look like a napkin.)
*Can go on all terrain
*Easier to repair
*Can be in rain
and don't bring out "LOL, Ant can crawl" Ant can't Crawl while paralyzed in fear, read the books. Now going to The assembly line is possible. BUT, it still has the Cutting edge tech, that thing can counter anything Ant can bring, sorry, lucky man or not Ant is a napkin, and a dead one.
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But an ant can: -be split in half, giving you 2 ants -be set on fire, making it a walking fireball -small, making it hard for the tank to locate -black, so they're able to be invisible at night -many legs, so they can move faster than your average insect -ability to crawl under small objects, those which a tank cannot -can crawl on the tank, and onto the driver, then go in his mouth, and have ant-babies, which will infest the driver of the tank, and ultimately kill him