Weapon/Tanks Licenses


Im about to create an Game which plays in the cold war era. Now I heard that some weapons are licensed.
I was planning to use some weapons models from the Marketplace, so where do I need to watch out.

Is there an “safe way” to use the weapons and tanks or do I need to check if the weapon/tank model design is licensed?
How did you guys fix that issue.

Im not interested in paying licenses from companys ^^

thanks in advance!

best regards