I rather we design a unique symbol for each different ranking. That would make it seem much more interesting for new members and old.
I'm ambivalent with the latter sentence. But you're right, it seems that would be a better option than just copying the SCP format.
I would suggest the design be stylized Greek alphabet letters. Be sure to include a very unique symbol for the Intelligentsia seeing as they are the secret power behind the scenes. Let us strive for unique interesting symbols rather than derivatives of the logo please.
There is only one thing I would ask never to be used, and that is a runic symbol, a glyph, or any other fantasy thing. I simply don't like it. I would recommend that for the Isosceles Aurum Cell site's magic background, but not here. I will, however, reluctantly agree to the use of stylized Greek letters, seeing as that's a logical step. But it still needs to fit the CI's futuristic view. We need to go Noir, methinks.
And the Intelligentsia. Special treatment for Intelligentsia? Let's see what I could come up with. The one thing I'm iffy about is the name. I read it on a Marvel comic once or twice. Ditto for Ouranos, sans Marvel.
I put forward my resolution: clean, concise edges, and flat, and 'dull' (not shiny or bright) colors. We should go black, white, gray, but keep the color variety to a minimum.
IMPORTANT NOTE
One thing I've always wanted to portray about the Insurgency is the decentralization. That would go far enough that each cell, each region has their own style of logo (I would love to see this), own rank insignia, own personnel command structure (albeit should be a limited level of change from the usual; otherwise it's stupid).
We should do that.