shoulder emblems

in several shots now i've seen shoulder emblems, both on sapiens and on alternatives. the one on the sapien i would describe as a weird little monkey face in a circle. the one on the alternative i would describe as a skull with either a large lower jaw or something attached to the underside of the skull. i can't see how these would be part of the uniforms, therefore i think that they are some sort of identifiable emblem; likely either personal, clan, or guild emblems. somewhat reminiscent of halo 2, but welcome nonetheless.