There's Comic Con, why not a Military Con?

So I attended a Comic Con in Denver, CO last weekend, and it struck me as to why there is no Military Con? Have all the different branches, vehicles, artists, employers, va, celebrity veterans, etc, etc. for all of our active duty and veterans out there. A national thing, that most big cities could have and veterans and active members are able to attend to within certain radius'. It could also be a good time for the public to see Military type stuff and the things that veterans are doing afterwards and to reunite and talk war stories... Maybe I just think to much, or maybe its a good idea... what do you guys think?