Because, and no hate intended, it looks like after he got done rolling in the mud, he cleaned the shitters. It looks effective as hell, but the REMF brass will hate that their mens' uniforms always look dirty.
Also, this:
Utilizing our patented process, we created a palette of natural colors digitally sampled from real-world elements in carefully controlled lighting.
In the real world, there's no such thing as "carefully controlled lighting". You go from bright sunlight to dappled shade to dark building interiors and back again in seconds.
It looks absolutely fantastic in the composed shots they've got, against backdrops of similar color palettes. But the second he hits the woods, or a modern urban environment, he's toast.