It seems that the terms National Cadet Competition and National Color Guard Competition are used interchangeably. There is a definite difference.
There >was< a difference. In its current iteration, the NCC only includes the CG component, however this is clearly another area where the
regulations have not been updated, or NHQ needs to clarify the award.
While the current national
competition is referred to as "NCC", it isn't run as such based on 39-3's award criteria which would have it being an NCGC,
however it could be argued that a respective Wing or Region could present whatever decoration they feel is appropriate, irrespective of what NHQ issues to
those teams that ultimately make it to Dayton, in which case those teams would replace the green with the blue if appropriate (or not).
Another interesting nuance is that while there have been teams of both types at the same event, I've never heard it referred to as anything but NCC,
even in the years it had both types of competitions.