SI is guaranteed to be made in the USA, so they can more easily put the branding on them. For other sport performance models, 80% are made in the USA, but they won't make separate molds for those which aren't. Acetate, and wires are all made out of the country, but they've started showing that they are at least assembled in the US.
The Red colored badge is showing up on some models, which will hopefully allow them to add Made In USA on some models without having to create a new mold for them.