Terra-tron

The terran military has always been known for its superior base-defense capabilities and constant drive to improve its fortification technology. Take, for example, the newly developed Ares planetary fortress and Crucio siege tank, or the heavily upgraded Broadsword missile turret. A few of these alongside some bunkers packed with marines provide a solid wall of armor, neosteel, and firepower to repel any threat, alien or domestic.

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http://www.starcraft2.com/features/terran/terratron.xml