You might recognize these background extras:
They have weird hats, brown uniforms and a couple of patches. Here are some more pics:
The best references I have are for their red & black patch, which I at first assumed to be a cobra. The filenames here still reflect that:
But once I realized it might be an army unit patch, I was able to nail it: it is the emblem of the 27th Infantry Brigade, rotated 90 degrees:
I had no such luck with the other chest patch, which seems to be a black shield with three eagles on it.