Hmm ... I guess it's possible that some upcoming Kree Uncommon Heroes might be Soldiers ... though that's usually the class left for the rank and file, and is probably avoidable.
I know Sgt. Rock will be one, and I think that combo will be fun (and I doubt his personality will be Patriotic). Right now for the pro-mixers he combines nicely with Sgt. Drake as well.
I'm trying to think who else might be a unique hero in the future ... and I'm drawing a big blank.
Anyone?
Also, if you haven't chimed in on the "leash" for Super Soldier Scout, I'd love to hear from you. So far, Spidey seems to support the 6 spaces, and A3n seems to prefer no space restriction.