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The Bell UH1 is a prime example of a major problem.  It is associated with several wars - Korea and Vietnam to name two.  With a restriction on selling quality 3D representations, only bankrolls can afford to use them in any related way - or every CG person wanting to use one in a render or animation will have to model it him/her self.  I'm sorry, what security breach is caused by a representation of a 50 y/o helicopter again?

I suggest that any 3D modeler that works for or is contracted out by companies like Lockheed start charging hundreds of thousands of dollars for their work - trademark your individual modeling technique and request a license for the contractual use of it! ;P

Here's another trick for 3D modeler to "get around" all this legal binding stuff and I've seen lots of modelers doing this, is that you make NO MENTION of the actual product name AT ALL. Take the Bell UH-1 for example, when you sell this model product you rename it like "Army transport helicopter" or "Army Common Helicopter" and so forth but you DO NOT mention its actual product name at all, besides the 3D model you made is not the same actual working machine in real life.

In this way the 3D modelers can sell items that may look-alike real world objects without attracting too much attention from those corporate hired, sharp-eyed snitches.

Hope that helps, and I would suggest a move to a different 3D model store because that place(Turbo Squid) is definitely compromised and will draw a lot of attention, beside I found the idea of selling a 3D toothbrush model at 100 dollar (just a figure of speech) apiece outrageous and unacceptable.