[IMMentat]

A reasonable request. PS1 had a set of decals for an outfit to choose a sigil from.
Vehicles already cater to this idea so the trooper gear will probably have its own level of customisation.

#edit#
Do you mean upload your own image to be checked by the devs?
Or pick from a sizable database provided and selected by the devs and whatever suggestion box they look at? (more options usually results in lower detail, though the Diablo 3 banners would be a fantastic system to emulate, many simple components coming together into a #mostly# unique emblem)

Personal uploads I can't see happening, due to copywrite laws and the hastle of manually checking a few hundred thousand images. ATB online allowed it but the game was crap and the setting more gangland so the system will be forgotten for a few years before someone else tries again.