"Companies like Lockheed aren't spending their money trying to make the coolest designs- their research and development is all about how to make the best, fastest, most powerful, and most effecient machine for their clients. In many cases, the client is the US government."
That's a completely wrong perception. Lockheed and other military aircraft designers do spent time in having their model look cool. They always have, it's part of their appeal. They spent much time on making sure the plane isn't only efficient, but also looks good. So, according to your own statement, that gives them the right to copyright it also.

Artwork and 3DToons items, create the perfect place for you toon and other figures!

http://www.renderosity.com/mod/bcs/index.php?vendor=23722

Due to the childish TOS changes, I'm not allowed to link to my other products outside of Rendo anymore :(

Food for thought.....
https://www.youtube.com/watch?v=pYZw0dfLmLk