Just something they're testing out for the war department.
To answer the question, I don't think those troopers are any different rank than any of the others (Bly excluded) in that scene... They're just regular grunts.
What's a "grunt" though? Isn't it a generic term to refer to combat soldiers who hold no command rank? They'd still have different ranks like private, etc, I would think. Maybe Anton's on to something.
If I was taking a page (or scene) from M*A*S*H, I'd say, Corporal Captain.
Anyway, this SW continuity **** is clearly no science. I'll just use my imagination. Before, I was thinking lower rank, but now I'm imagining them to be some sort of specialists; sharpshooters or demolitions or something. I stuck my two in with the three Evo guys I have, and so far I have one of them using the pistols where most of the others carry their rifles. Since I've had them, I've had one of the Evos (who I think of as the captain under Bly
) carrying the short rifle. I have him posed holding his helmet under his arm.
I really like that they made these reverse pauldron guys. Bly and the Star Corp are my favorite clone troopers. As inane and continuity-defying as GAR military business is, I like the variety these figures lend my little Felucia display. Bly and his command markings, plus macros; helmets on, helmets off; different pauldrons; 3 different gun choices. They look neat displayed together.
BTW, they do stand out with that clean, undamaged armor, though, don't they?