It depends upon what military you are talking about and what
type of tank the battalion utilizes or is it diverse? For a light
tank battalion the numbers will be greater than a Main Battle Tank
battalion.
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Try googling "battalion profiles"
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the 808th tank destroyer battalion was in WW2. tanks were just
coming around at the end of WW1 so there was no such thing as a
tank destroyer battalion. also, my grandfather was in the 808th
TDB.