You may have seen the "Secret Squirrel" patch around. There's even one clearly visible in the movie Zero Dark Thirty. You can get them, in many colors and materials from Milspec Monkey.
But I designed them. And for a few years, bought hundreds at a time, took orders from locals and obscure military/government/police forums (the US Secret Service were particular fans) and mailed them out all over the world. Eventually, I got tired of this, so gave it to Money Boy to deal with instead.
Note, due to the timeline, if it was indeed worn by someone in Neptune Spear, it looked like the above and not the new MSM ones. If this happened, I personally sold it to the actual guy who wore it. This is entirely plausible.