I am currently writing something about concealment for our tac team and I am drawing a blank. I remember from several sources a list of the main target indicators but I feel like I am leaving something out and can not locate my sources. What I have now is movement, sound, shine, shape, color. I just feel like I am forgetting something. IR and heat signatures are not relevant to what I am writing. Can any body help me out? I am not looking for specific things like "dust signature" as that is simply movement of the ground debris.