X-COM is an awesome squad tactics game where you defend the earth from aliens.
If you don't know what Scooby Doo is, I can't help you. No one can.
I was watching BeagleRush's X-COM videos, and he made a reference to Scooby Doo, referring to his soldiers as the members of the gang. This sparked an idea in my head, what if the gang actually became members of X-COM? And thus this shirt was born. The X-COM Mystery Marines. You solve mysteries by shooting things in the face, right?