Revert "Update tank_heavy_armor.json"

This reverts commit 3fba24e2417b832ac922b0c7cb8f82febb790461.
Revert "Vanguard should now be amphibious instead of amphibiouis."

This reverts commit b9dac3205a9cfe2e467c3ef03e7384ab83e83444.
Revert "(Hopefully) made the Vanguard an amphibious transport."

This reverts commit 66a1df064ff11545025700d2515afc19baa24495.