We're Getting Mutants in the MCU - The Loop
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Even though you can't see that CB on the Tank Driver Ribbon on non Tank Crew soldiers, you can in fact unlock the CB on a non-Tank Crew soldier by simply stealing and driving around in tanks, unlocking the corresponding Ribbon Ranks.
|TANK THIEF||Ribbon Rank|
|Studying armor ignition systems enables you to steal enemy tanks faster.|
|Faster unlock of tanks|