|Pay no attention to the background...|
I did a photoshop mockup of where I'd put the symbols in each case, and toyed with them until I found a setup I didn't dislike. First I'll show the easier ones to solve, then on to the harder choices.
The Prowler was one of the first models I painted (and one of the first I bought: Such an awesome pose.) He's the test-case for drab, and other than his pistol's grip, is remarkably subtle compared to some of the other schemes I've seen of him. The symbols for him seemed pretty straightforward; Nomad on the left shoulder, Bakunin on the right, so any enemy that spots him will see the "national" pride, whereas his allies will know where he came from.
Next up were the Hellcats. Being troops that scream in from a dropship on jets of antigrav (?), I was less concerned about 'stealth', which is why their shoulderpads have a nice distinctive Corregidor and Nomad icon. The back of their burners have squad identifiers (3-1, 3-2, 3-3) in case I ever have to distinguish them quickly stats-wise.
I did struggle with this at first, because though they are line troopers, it's implied in the fluff they're often called upon to do shipboard combat. I figure in such situations, with cramped corridors, and a race against the clock and overwhelming odds, it's more important to whip around a corner and recognize an ally. Also, camouflage in an enemy ship would be difficult to guess ahead of time. Eventually I went more subtle because it kept the theme more consistent.
Also note the Wildcat's random disks at the front of the armour. Again, since Corregidor is often called upon to engage in zero-g or hostile spaceborn environments, having on-suit lamps that aren't attached to a gun or hand-held would be incredibly useful. I figure they're suit lamps (off when in daylight, of course) and perhaps that left-forearm device is as well.
Thus is my war against glowy armour on stealth units going strong! Since these photos I gave a dark, dark cyan wash to the helmet visors to make them richer, and to the gems to help settle the layers in.
Soon, pics of the Reverend Custodier, Zondbots, Intruder, Alguacile... I wonder if I'll have them all done by the time Icestorm shows up!