This may have already been discovered. I'm a bit slow. But, regardless:
I was making some desktops for myself using some very large Craig Mullins Marathon pieces that I had found, when I started editing this image. The size I have of that image is 1296x1520, so I could see quite a bit of detail. I had zoomed in on the SPNKR so that I could snip a little of the selection to get the size right, and I noticed that there are some Marathon symbols on the lower barrel. I was pretty disappointed that there were only five, but then I remembered that there was a logo on his helmet and on his suit. Seven in all. Here's an image:
I felt giddy. Like I said, this has probably already been shown, but I figured I'd point it out just in case.